SSC CGL 16 Aug 2015 Shift 2 Paper

Question : 119 of 200

Marks: +1, -0

A librarian purchased 50 story– books for his library. But he saw that he could get14 more books by spending Rs. 76 more and the average price per book would be reduced by Re. 1. The average price (in Rs.) of each book he bought, was :

Validate

Solution:

Let the average cost of each book bought (of 64 books) be Rs. x.
According to the question,
64 × x – 50(x + 1) = 76
⇒ 64x – 50x – 50 = 76
⇒ 14x = 76 + 50 = 126
⇒ x =

{126}/{14}

= 9
∴ Required average price
= 9 + 1 = Rs. 10

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