Question

In a set of 40 books, there out of five books are science book. Find the number of science books.

Answer 1

Heya mate !
Good Morning !!
Here , If the ratio is three books out of five are science , then what will be the no. of science books in the set of 40 books .

We can write it as :-
3:5 :: ? :40

To solve ,
3/5 = x/40 ..

By cross multiplication ,
5x = 40×3
5x = 120
x = 24

Hence , there are 24 science books in the set .


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Answer 2

Answer:

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