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

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

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

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

The weight of 72 books is 9kg. What is the weight of 80 such books? How many such books weigh 6 kg?

The weight of 72 books is 9kg .What is the weight of 80 such books? How many such books weigh 6kg ?

The weight of 65 books is 13 kg. a. What is the weight of 80 such books? b. How many such books weigh 6.4 kg?

The weight of 30 boxes Is 6 kg. What is the weight of 1080 such boxes ?