Portrait Puzzle

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In an art exhibition held during the 70th Independence Day celebrations in Delhi, five portraits of five wellknown freedom fighters namely Mahatma Gandhi, Bhagat Singh, Lal Bahadur Shastri, Lala Lajpat Rai and Jawaharlal Nehru were displayed. All these portraits were of different colors: red, orange, blue, violet, pink(not necessarily in the same order). All these five portraits were displayed with a different number of story books, with each portrait having at least one story book.



Some additional information is given below:



  • The number of story books displayed at the violet colored portrait was equal to two-fifths of the absolute difference between the number of story books displayed at the portraits of Lala Lajpat Rai and Jawaharlal Nehru.

  • Portraits of Lala Lajpat Rai and Jawaharlal Nehru were not of violet color.

  • The number of story books displayed at the blue colored portrait was one-third of the sum of the number of story books displayed at the portraits of Bhagat Singh and Lal Bahadur Shastri.

  • Portraits of Bhagat Singh and Lal Bahadur Shastri were not of blue color.

  • The number of story books displayed at the Jawaharlal Nehru portrait was half the number of story books displayed at the pink colored portrait.

  • Mahatma Gandhi portrait was neither red colored nor violet colored.

  • The number of story books displayed at the Jawaharlal Nehru portrait was equal to the sum of the number of story books displayed at the red and blue colored portraits.

  • Jawaharlal Nehru portrait was neither red colored nor blue colored


  1. Color(s) of how many portraits can be determined uniquely?


  2. If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.


  3. Which of the following statement(s) is/are necessarily TRUE?

    (i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.

    (ii) The blue colored portrait could be of Lal Bahadur Shastri.

    (iii) The red colored portrait could not be of Lala Lajpat Rai.


  4. Which of the following statements are required, to uniquely determine colours of all the portraits?

    (i) Lala Lajpat Rai portrait is red coloured

    (ii) Portrait of Bhagat Singh is not pink coloured

    (iii) Portrait of Mahatma Gandhi is not orange coloured










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  • Is rounding allowed for the number of books clues? For example if it says A has a third of the number of books that B has, and B has 7 would you round to 2 or do the values have to have no remainder?
    – gabbo1092
    3 hours ago










  • Welcome to Puzzling! Where is this puzzle from?
    – Deusovi♦
    2 hours ago










  • It is from India.
    – sam
    1 hour ago














up vote
2
down vote

favorite












In an art exhibition held during the 70th Independence Day celebrations in Delhi, five portraits of five wellknown freedom fighters namely Mahatma Gandhi, Bhagat Singh, Lal Bahadur Shastri, Lala Lajpat Rai and Jawaharlal Nehru were displayed. All these portraits were of different colors: red, orange, blue, violet, pink(not necessarily in the same order). All these five portraits were displayed with a different number of story books, with each portrait having at least one story book.



Some additional information is given below:



  • The number of story books displayed at the violet colored portrait was equal to two-fifths of the absolute difference between the number of story books displayed at the portraits of Lala Lajpat Rai and Jawaharlal Nehru.

  • Portraits of Lala Lajpat Rai and Jawaharlal Nehru were not of violet color.

  • The number of story books displayed at the blue colored portrait was one-third of the sum of the number of story books displayed at the portraits of Bhagat Singh and Lal Bahadur Shastri.

  • Portraits of Bhagat Singh and Lal Bahadur Shastri were not of blue color.

  • The number of story books displayed at the Jawaharlal Nehru portrait was half the number of story books displayed at the pink colored portrait.

  • Mahatma Gandhi portrait was neither red colored nor violet colored.

  • The number of story books displayed at the Jawaharlal Nehru portrait was equal to the sum of the number of story books displayed at the red and blue colored portraits.

  • Jawaharlal Nehru portrait was neither red colored nor blue colored


  1. Color(s) of how many portraits can be determined uniquely?


  2. If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.


  3. Which of the following statement(s) is/are necessarily TRUE?

    (i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.

    (ii) The blue colored portrait could be of Lal Bahadur Shastri.

    (iii) The red colored portrait could not be of Lala Lajpat Rai.


  4. Which of the following statements are required, to uniquely determine colours of all the portraits?

    (i) Lala Lajpat Rai portrait is red coloured

    (ii) Portrait of Bhagat Singh is not pink coloured

    (iii) Portrait of Mahatma Gandhi is not orange coloured










share|improve this question























  • Is rounding allowed for the number of books clues? For example if it says A has a third of the number of books that B has, and B has 7 would you round to 2 or do the values have to have no remainder?
    – gabbo1092
    3 hours ago










  • Welcome to Puzzling! Where is this puzzle from?
    – Deusovi♦
    2 hours ago










  • It is from India.
    – sam
    1 hour ago












up vote
2
down vote

favorite









up vote
2
down vote

favorite











In an art exhibition held during the 70th Independence Day celebrations in Delhi, five portraits of five wellknown freedom fighters namely Mahatma Gandhi, Bhagat Singh, Lal Bahadur Shastri, Lala Lajpat Rai and Jawaharlal Nehru were displayed. All these portraits were of different colors: red, orange, blue, violet, pink(not necessarily in the same order). All these five portraits were displayed with a different number of story books, with each portrait having at least one story book.



Some additional information is given below:



  • The number of story books displayed at the violet colored portrait was equal to two-fifths of the absolute difference between the number of story books displayed at the portraits of Lala Lajpat Rai and Jawaharlal Nehru.

  • Portraits of Lala Lajpat Rai and Jawaharlal Nehru were not of violet color.

  • The number of story books displayed at the blue colored portrait was one-third of the sum of the number of story books displayed at the portraits of Bhagat Singh and Lal Bahadur Shastri.

  • Portraits of Bhagat Singh and Lal Bahadur Shastri were not of blue color.

  • The number of story books displayed at the Jawaharlal Nehru portrait was half the number of story books displayed at the pink colored portrait.

  • Mahatma Gandhi portrait was neither red colored nor violet colored.

  • The number of story books displayed at the Jawaharlal Nehru portrait was equal to the sum of the number of story books displayed at the red and blue colored portraits.

  • Jawaharlal Nehru portrait was neither red colored nor blue colored


  1. Color(s) of how many portraits can be determined uniquely?


  2. If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.


  3. Which of the following statement(s) is/are necessarily TRUE?

    (i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.

    (ii) The blue colored portrait could be of Lal Bahadur Shastri.

    (iii) The red colored portrait could not be of Lala Lajpat Rai.


  4. Which of the following statements are required, to uniquely determine colours of all the portraits?

    (i) Lala Lajpat Rai portrait is red coloured

    (ii) Portrait of Bhagat Singh is not pink coloured

    (iii) Portrait of Mahatma Gandhi is not orange coloured










share|improve this question















In an art exhibition held during the 70th Independence Day celebrations in Delhi, five portraits of five wellknown freedom fighters namely Mahatma Gandhi, Bhagat Singh, Lal Bahadur Shastri, Lala Lajpat Rai and Jawaharlal Nehru were displayed. All these portraits were of different colors: red, orange, blue, violet, pink(not necessarily in the same order). All these five portraits were displayed with a different number of story books, with each portrait having at least one story book.



Some additional information is given below:



  • The number of story books displayed at the violet colored portrait was equal to two-fifths of the absolute difference between the number of story books displayed at the portraits of Lala Lajpat Rai and Jawaharlal Nehru.

  • Portraits of Lala Lajpat Rai and Jawaharlal Nehru were not of violet color.

  • The number of story books displayed at the blue colored portrait was one-third of the sum of the number of story books displayed at the portraits of Bhagat Singh and Lal Bahadur Shastri.

  • Portraits of Bhagat Singh and Lal Bahadur Shastri were not of blue color.

  • The number of story books displayed at the Jawaharlal Nehru portrait was half the number of story books displayed at the pink colored portrait.

  • Mahatma Gandhi portrait was neither red colored nor violet colored.

  • The number of story books displayed at the Jawaharlal Nehru portrait was equal to the sum of the number of story books displayed at the red and blue colored portraits.

  • Jawaharlal Nehru portrait was neither red colored nor blue colored


  1. Color(s) of how many portraits can be determined uniquely?


  2. If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.


  3. Which of the following statement(s) is/are necessarily TRUE?

    (i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.

    (ii) The blue colored portrait could be of Lal Bahadur Shastri.

    (iii) The red colored portrait could not be of Lala Lajpat Rai.


  4. Which of the following statements are required, to uniquely determine colours of all the portraits?

    (i) Lala Lajpat Rai portrait is red coloured

    (ii) Portrait of Bhagat Singh is not pink coloured

    (iii) Portrait of Mahatma Gandhi is not orange coloured







logical-deduction






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edited 4 hours ago









M Oehm

33.8k1104154




33.8k1104154










asked 4 hours ago









sam

366




366











  • Is rounding allowed for the number of books clues? For example if it says A has a third of the number of books that B has, and B has 7 would you round to 2 or do the values have to have no remainder?
    – gabbo1092
    3 hours ago










  • Welcome to Puzzling! Where is this puzzle from?
    – Deusovi♦
    2 hours ago










  • It is from India.
    – sam
    1 hour ago
















  • Is rounding allowed for the number of books clues? For example if it says A has a third of the number of books that B has, and B has 7 would you round to 2 or do the values have to have no remainder?
    – gabbo1092
    3 hours ago










  • Welcome to Puzzling! Where is this puzzle from?
    – Deusovi♦
    2 hours ago










  • It is from India.
    – sam
    1 hour ago















Is rounding allowed for the number of books clues? For example if it says A has a third of the number of books that B has, and B has 7 would you round to 2 or do the values have to have no remainder?
– gabbo1092
3 hours ago




Is rounding allowed for the number of books clues? For example if it says A has a third of the number of books that B has, and B has 7 would you round to 2 or do the values have to have no remainder?
– gabbo1092
3 hours ago












Welcome to Puzzling! Where is this puzzle from?
– Deusovi♦
2 hours ago




Welcome to Puzzling! Where is this puzzle from?
– Deusovi♦
2 hours ago












It is from India.
– sam
1 hour ago




It is from India.
– sam
1 hour ago










1 Answer
1






active

oldest

votes

















up vote
4
down vote













Color(s) of how many portraits can be determined uniquely?




Nehru is orange, I believe that's all we have. We know that from (2) Nehru is not violet, from (5) is not pink, and from (8) is neither red nor blue. Therefore he must be orange. You know that Rai can't be violet, Singh and Shastri can't be blue, and Gandhi can't be red or violet but you can't determine from the 8 bullet points any more information from this.




If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.




If Shastri is pink, Gandhi must be blue, since his is not red or violet. Then Rai is red because his is not violet, and so Singh is violet. Then blue = Nehru - red => Gandhi = Nehru - Rai = 10. Therefore 10 story books at the Gandhi portrait.




Which of the following statement(s) is/are necessarily TRUE?
(i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.




TRUE: (2) says Rai and Nehru aren't violet; (6) says Gandhi is not either.




(ii) The blue colored portrait could be of Lal Bahadur Shastri.




FALSE: Shastri is not blue, because of (4).




(iii) The red colored portrait could not be of Lala Lajpat Rai.




FALSE: The red coloured portrait could be of Rai (Based on the second question asked, if Shastri is pink, then Rai is red).




Which of the following statements are required, to uniquely determine colours of all the portraits?
(i) Lala Lajpat Rai portrait is red coloured




Not unique. Singh and Shastri could be either violet or pink.




(ii) Portrait of Bhagat Singh is not pink coloured




Not unique either. Gandhi could be pink, then Rai would be blue, and Singh could be red and Shastri violet. Or Gandhi pink, Rai blue, Singh violet, and Shastri red. More than one possibility, therefore not unique.




(iii) Portrait of Mahatma Gandhi is not orange coloured




NOT REQUIRED (We know Nehru is Orange already).




Answer:




You'd need the combination of (i) and (ii) to determine the colours uniquely. Why? Nehru is orange. Then (i) says that Rai is red. Then Singh and Shastri both can't be blue, so Gandhi must be Blue. Then (ii) says that Singh is not pink, so Shastri must be pink. Then Singh must be violet.







share|improve this answer






















  • Please share your approach. Your answers are correct.
    – sam
    3 hours ago






  • 1




    @sam updated to include more of my workings.
    – El-Guest
    3 hours ago










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
4
down vote













Color(s) of how many portraits can be determined uniquely?




Nehru is orange, I believe that's all we have. We know that from (2) Nehru is not violet, from (5) is not pink, and from (8) is neither red nor blue. Therefore he must be orange. You know that Rai can't be violet, Singh and Shastri can't be blue, and Gandhi can't be red or violet but you can't determine from the 8 bullet points any more information from this.




If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.




If Shastri is pink, Gandhi must be blue, since his is not red or violet. Then Rai is red because his is not violet, and so Singh is violet. Then blue = Nehru - red => Gandhi = Nehru - Rai = 10. Therefore 10 story books at the Gandhi portrait.




Which of the following statement(s) is/are necessarily TRUE?
(i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.




TRUE: (2) says Rai and Nehru aren't violet; (6) says Gandhi is not either.




(ii) The blue colored portrait could be of Lal Bahadur Shastri.




FALSE: Shastri is not blue, because of (4).




(iii) The red colored portrait could not be of Lala Lajpat Rai.




FALSE: The red coloured portrait could be of Rai (Based on the second question asked, if Shastri is pink, then Rai is red).




Which of the following statements are required, to uniquely determine colours of all the portraits?
(i) Lala Lajpat Rai portrait is red coloured




Not unique. Singh and Shastri could be either violet or pink.




(ii) Portrait of Bhagat Singh is not pink coloured




Not unique either. Gandhi could be pink, then Rai would be blue, and Singh could be red and Shastri violet. Or Gandhi pink, Rai blue, Singh violet, and Shastri red. More than one possibility, therefore not unique.




(iii) Portrait of Mahatma Gandhi is not orange coloured




NOT REQUIRED (We know Nehru is Orange already).




Answer:




You'd need the combination of (i) and (ii) to determine the colours uniquely. Why? Nehru is orange. Then (i) says that Rai is red. Then Singh and Shastri both can't be blue, so Gandhi must be Blue. Then (ii) says that Singh is not pink, so Shastri must be pink. Then Singh must be violet.







share|improve this answer






















  • Please share your approach. Your answers are correct.
    – sam
    3 hours ago






  • 1




    @sam updated to include more of my workings.
    – El-Guest
    3 hours ago














up vote
4
down vote













Color(s) of how many portraits can be determined uniquely?




Nehru is orange, I believe that's all we have. We know that from (2) Nehru is not violet, from (5) is not pink, and from (8) is neither red nor blue. Therefore he must be orange. You know that Rai can't be violet, Singh and Shastri can't be blue, and Gandhi can't be red or violet but you can't determine from the 8 bullet points any more information from this.




If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.




If Shastri is pink, Gandhi must be blue, since his is not red or violet. Then Rai is red because his is not violet, and so Singh is violet. Then blue = Nehru - red => Gandhi = Nehru - Rai = 10. Therefore 10 story books at the Gandhi portrait.




Which of the following statement(s) is/are necessarily TRUE?
(i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.




TRUE: (2) says Rai and Nehru aren't violet; (6) says Gandhi is not either.




(ii) The blue colored portrait could be of Lal Bahadur Shastri.




FALSE: Shastri is not blue, because of (4).




(iii) The red colored portrait could not be of Lala Lajpat Rai.




FALSE: The red coloured portrait could be of Rai (Based on the second question asked, if Shastri is pink, then Rai is red).




Which of the following statements are required, to uniquely determine colours of all the portraits?
(i) Lala Lajpat Rai portrait is red coloured




Not unique. Singh and Shastri could be either violet or pink.




(ii) Portrait of Bhagat Singh is not pink coloured




Not unique either. Gandhi could be pink, then Rai would be blue, and Singh could be red and Shastri violet. Or Gandhi pink, Rai blue, Singh violet, and Shastri red. More than one possibility, therefore not unique.




(iii) Portrait of Mahatma Gandhi is not orange coloured




NOT REQUIRED (We know Nehru is Orange already).




Answer:




You'd need the combination of (i) and (ii) to determine the colours uniquely. Why? Nehru is orange. Then (i) says that Rai is red. Then Singh and Shastri both can't be blue, so Gandhi must be Blue. Then (ii) says that Singh is not pink, so Shastri must be pink. Then Singh must be violet.







share|improve this answer






















  • Please share your approach. Your answers are correct.
    – sam
    3 hours ago






  • 1




    @sam updated to include more of my workings.
    – El-Guest
    3 hours ago












up vote
4
down vote










up vote
4
down vote









Color(s) of how many portraits can be determined uniquely?




Nehru is orange, I believe that's all we have. We know that from (2) Nehru is not violet, from (5) is not pink, and from (8) is neither red nor blue. Therefore he must be orange. You know that Rai can't be violet, Singh and Shastri can't be blue, and Gandhi can't be red or violet but you can't determine from the 8 bullet points any more information from this.




If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.




If Shastri is pink, Gandhi must be blue, since his is not red or violet. Then Rai is red because his is not violet, and so Singh is violet. Then blue = Nehru - red => Gandhi = Nehru - Rai = 10. Therefore 10 story books at the Gandhi portrait.




Which of the following statement(s) is/are necessarily TRUE?
(i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.




TRUE: (2) says Rai and Nehru aren't violet; (6) says Gandhi is not either.




(ii) The blue colored portrait could be of Lal Bahadur Shastri.




FALSE: Shastri is not blue, because of (4).




(iii) The red colored portrait could not be of Lala Lajpat Rai.




FALSE: The red coloured portrait could be of Rai (Based on the second question asked, if Shastri is pink, then Rai is red).




Which of the following statements are required, to uniquely determine colours of all the portraits?
(i) Lala Lajpat Rai portrait is red coloured




Not unique. Singh and Shastri could be either violet or pink.




(ii) Portrait of Bhagat Singh is not pink coloured




Not unique either. Gandhi could be pink, then Rai would be blue, and Singh could be red and Shastri violet. Or Gandhi pink, Rai blue, Singh violet, and Shastri red. More than one possibility, therefore not unique.




(iii) Portrait of Mahatma Gandhi is not orange coloured




NOT REQUIRED (We know Nehru is Orange already).




Answer:




You'd need the combination of (i) and (ii) to determine the colours uniquely. Why? Nehru is orange. Then (i) says that Rai is red. Then Singh and Shastri both can't be blue, so Gandhi must be Blue. Then (ii) says that Singh is not pink, so Shastri must be pink. Then Singh must be violet.







share|improve this answer














Color(s) of how many portraits can be determined uniquely?




Nehru is orange, I believe that's all we have. We know that from (2) Nehru is not violet, from (5) is not pink, and from (8) is neither red nor blue. Therefore he must be orange. You know that Rai can't be violet, Singh and Shastri can't be blue, and Gandhi can't be red or violet but you can't determine from the 8 bullet points any more information from this.




If Lal Bahadur Shastri portrait was of Pink color and the absolute difference between the number of story books displayed at Lala Lajpat Rai portrait and Jawaharlal Nehru portrait was 10, find the number of story books displayed at Mahatma Gandhi portrait.




If Shastri is pink, Gandhi must be blue, since his is not red or violet. Then Rai is red because his is not violet, and so Singh is violet. Then blue = Nehru - red => Gandhi = Nehru - Rai = 10. Therefore 10 story books at the Gandhi portrait.




Which of the following statement(s) is/are necessarily TRUE?
(i) The violet colored portrait could not be of Lala Lajpat Rai, Jawaharlal Nehru or Mahatma Gandhi.




TRUE: (2) says Rai and Nehru aren't violet; (6) says Gandhi is not either.




(ii) The blue colored portrait could be of Lal Bahadur Shastri.




FALSE: Shastri is not blue, because of (4).




(iii) The red colored portrait could not be of Lala Lajpat Rai.




FALSE: The red coloured portrait could be of Rai (Based on the second question asked, if Shastri is pink, then Rai is red).




Which of the following statements are required, to uniquely determine colours of all the portraits?
(i) Lala Lajpat Rai portrait is red coloured




Not unique. Singh and Shastri could be either violet or pink.




(ii) Portrait of Bhagat Singh is not pink coloured




Not unique either. Gandhi could be pink, then Rai would be blue, and Singh could be red and Shastri violet. Or Gandhi pink, Rai blue, Singh violet, and Shastri red. More than one possibility, therefore not unique.




(iii) Portrait of Mahatma Gandhi is not orange coloured




NOT REQUIRED (We know Nehru is Orange already).




Answer:




You'd need the combination of (i) and (ii) to determine the colours uniquely. Why? Nehru is orange. Then (i) says that Rai is red. Then Singh and Shastri both can't be blue, so Gandhi must be Blue. Then (ii) says that Singh is not pink, so Shastri must be pink. Then Singh must be violet.








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share|improve this answer



share|improve this answer








edited 3 hours ago

























answered 3 hours ago









El-Guest

13.9k2965




13.9k2965











  • Please share your approach. Your answers are correct.
    – sam
    3 hours ago






  • 1




    @sam updated to include more of my workings.
    – El-Guest
    3 hours ago
















  • Please share your approach. Your answers are correct.
    – sam
    3 hours ago






  • 1




    @sam updated to include more of my workings.
    – El-Guest
    3 hours ago















Please share your approach. Your answers are correct.
– sam
3 hours ago




Please share your approach. Your answers are correct.
– sam
3 hours ago




1




1




@sam updated to include more of my workings.
– El-Guest
3 hours ago




@sam updated to include more of my workings.
– El-Guest
3 hours ago

















 

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