Question

72 books weigh 8 Kg . what is the weight of 81 such books? how many such books will weigh 6 Kg?​

Answer 1

Books. 72 ?
Weight. 8 6

This is case of direct variation

:. 72×6/8
=9×6=54

Therefore 54 books will weigh 6 kg


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Answer 2

Answer:

54

Step-by-step explanation:

weight of 72 books=8 kg

weight of 1 book =8\72

weight of 81 such books = 8\72multiply by 81 =9 kg

number of books with a weight of 9 kg = 81

number of books that will weigh 6 kg = 81\9 multiplied by 6 = 54