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Study the following information carefully to answer the given question.
There are total five shelves in a library with different numbers of different types of books. The number of story books is 315, that is 30% of the total number of books in the library. The ratio of the number of inspirational books to the number of autobiography books is 3 : 4. The number of journals is 2/3 rd of the number of novels. The number of novels is equal to the sum of 10% of the total number of books and the number of journals.
Q. What percentage of the total number of books are novels?
  • a)
    30 %
  • b)
    32 %
  • c)
    36 %
  • d)
    40 %
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Study the following information carefully to answer the given question...
Let the total number of books in the library be 'x'.
Number of story books = 30% of x = 315

Let the number of novels be 'y' and the number of journals be 'z'.
So, number of journals,  z = 2/3 x y ...(1)
Number of novels, y = 10% of 1050 + z ... (2)
Using (1) in (2),

3y = 315 + 2y
y = 315
Number of novels, y = 315
So, number of journals = 2/3 x 315 = 210
So, total number of inspirational books and autobiography books = 1050 - (315 + 315 + 210)
Ratio of the number of inspirational books to the number of books of autobiography books = 3 : 4
Let the number of inspirational books be 3k and the number of autobiography books be 4k.
3k + 4k = 210
k = 30
Number of inspirational books = 3 × 30 = 90
Number of autobiography books = 4 × 30 = 120
Required percentage 
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Study the following information carefully to answer the given question.There are total five shelves in a library with different numbers of different types of books. The number of story books is 315, that is 30% of the total number of books in the library. The ratio of the number of inspirational books to the number of autobiography books is 3 : 4. The number of journals is 2/3 rd of the number of novels. The number of novels is equal to the sum of 10% of the total number of books and the number of journals.Q.What percentage of the total number of books are novels?a)30 %b)32 %c)36 %d)40 %Correct answer is option 'A'. Can you explain this answer?
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