The weight of 72 books is 9 kg.
What is the weight of 80 such books?
Weight of 72 books =9kg
Weight of 1 book =972kg
Weight of 80 books =80×972=10kg
Hence, the weight of 80 books is 10kg.
The weight of 65 books is 13 kg.(i) What is the weight of 80 such books?(ii) How many such books weigh 6.4 kg?
The weight of 72 books is 9 kg. What is the weight of 40 such books?