The wight of 72 books is 9 kg. What is the wight of such 40 books? Share with your friends Share 0 Varun.Rawat answered this Weight of 72 books = 9 kgWeight of 1 book = 972 kg = 18 kgWeight of 40 books = 18 × 40 = 5 kg 0 View Full Answer Joshithaa answered this No . of books for 1 kg = 72 / 9 = 8 Weight of 40 such books = 40 / 8 = 5 2 Ananya Gupta answered this weight of 72 books=9kg weight of 1 book=72/9=8 weight of 40 such books=8*40=5kg 3 Sayan Nandy answered this Ananya. 8*40 will be 320 kg -1 Axhiii answered this 72/9=8 so 40 such books=8x40=320 kg -1 Kunal Arya answered this find the cost of one book and then multiply the cost by320 -2