How does one translate the following question to math terms?

Is the answer 60% ??

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@khalilullahtaj , okay so assume that in the private library, there are 2 kinds of books, x and y where x = non-paperback books and y = paperback books.

Given: paperback biographies = 5% of y

Given: paperback biographies = 3% of (x+y) (because it is written of all the books, thus x+y)

Equate them, 3% of (x+y) = 5% of y

we have to find y, thus

y = \frac{3%}{5%}(x+y) which is 60%

Thanks a lot. I was somehow not deducing, library= paperback + non-paperback

Yes, you are correct.