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Ratio

The ratio of ...

Question

The ratio of story books in a library to other books is 1 : 7. The total number of story books is 800. Find the total number of books in the library.

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Solution

The ratio of story books in a library to other books is 1 : 7.

Out of (1 + 7) = 8 books, 1 book is a story book

Therefore,

When number of story books is 1, the total number of books = 8

When number of story books is 800, the total number of books = 8 $\times$ 800
= 6400

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