Question

The wright of 72 books is 9 kg what is weight of 40 books​

Answer 1

Answer:

5 kg

Step-by-step explanation:

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.

Answer 2

Step-by-step explanation:

Weight of 72 books = 9 kg

Weight of 1 book =

$\frac{9}{72} kg$

Weight of 40 books =

$\frac{9}{72} \times 40 = \frac{9}{72} \times \frac{40}{1}$

$\frac{360}{72} = 5 \: kg$