Question

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

Answer 1

Answer:

Weight of 72 books=9kg

Weight of 1 book=9/72=1/8kg

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

Thus, the weight of 40 such books is 5 kg.

Step-by-step explanation:

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Answer 2

$72 \: books = 9kg \\ 1 \: books \: = \frac{9}{72} \\ 40 \: books = \frac{9}{72} \times 40 \\ = \frac{1}{8} \times 40 = 5kg$

$hence \: the \: weight \: of \: 40 \: such \\ \: books \: are \: 5 \: kg$