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

Given:

The weight of 72 books is $9\ kg$.

To do:

We have to find the weight of 40 such books.

Solution:

The weight of 72 books $= 9\ kg$

Therefore,

The weight of 1 book $=\frac{9}{72}$

$=\frac{1}{8}\ kg$

The weight of 40 such books $=\frac{1}{8}\ kg\times40$

$=5\ kg$

The weight of 40 such books is $5\ kg$.

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