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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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