Question

The weight of 72 books is 9kg,What is the weight of 40 such books. Give the answer in ratio

Answer 1

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The weight of 72 books is 9 kg. What is the weight of 40 such books?

Solution:

Let's use the concept of the unitary method.

From the given data,

Weight of 72 books = 9 kg

Hence, the weight of 1 book = 9 / 72 = 1 / 8 kg

Therefore, the weight of 40 books = (1 / 8) × 40 = 5 kg

Thus, the weight of 40 books is 5 kg.

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Answer 2

72 books=9 kg

40 books=x

x=40*9/72

x=5 kg.

In ratios=72:9::40:5.

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