Verified answer

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

Weight of 72 books = 9 kg

Weight of 1 book = 9/72 = 1/8 kg

Weight of 40 books = 1/8 × 40

= 40/8

= 5 kg ans

Step-by-step explanation:

The weight of 72 books is 9kg

weight of one book = 9/72

= 0.125kg

weight of 40 books = 0.125×40

=5kg