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# Q.8 The weight of 72 books is 9 kg. What is the weight of 40 such books?

Weight of 1 book = $$\frac{9}{72} = \frac{1}{8}$$
So, weight of 40 books = $$\frac{1}{8}$$ × 40 = 5 kg
$$\therefore$$Weight of 40 books is 5 kg