Question

7. The weight of 72 books is 9 kg.
(a) Find the weight of 80 such books.
(b) How many books will weigh 6 kg?

Answer 1

Question

7. The weight of 72 books is 9 kg.

(a) Find the weight of 80 such books.

(b) How many books will weigh 6 kg?

ANSWER :

The weight of 72 books = 9kg

The weight of 1 book = $\frac{9}{72}$ = 0.125 kg

Now,

(a) The weight of 80 such books

= 80 × 0.125

= 10 kg  

(b) Numbers of books that will weigh 6 kg

= $\frac{6}{0.125}$ = 48 books

Hence,

The weight of 80 such books is 10 kg

and  

Numbers of books that will weigh 6 kg are 48 books

Answer 2

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