Question

the weight of 72 book is 9 kg what is the weight of 42 such book? ​

Answer 1

Answer:

Weight of 72 books = 9kg

$Weight of 1 book = \frac{9}{72} = \frac{1}{8} kg$

Therefore, weight of 40 books =

$\frac{1}{8} \times 40 = 5kg$

Thus the weight of 40 such books is 5 kg

___¯¯¯_________¯¯¯¯¯______