Discussion of Question with ID = 011 under Square-and-Cube-Roots

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Question

Each book of a shelf has as many pages as is the total number of books in that shelf. If there are 169 pages in all, how many books are there?

A

13.

B

16.

C

24.

D

9.

Soln.
Ans: a

Let the number of books = n. So pages in one book are also n, and therefore, pages in n books = $n^2$. We have been given $n^2 = 169$, which gives n = 13.


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