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

Answer:

(a) 10kg (b)48 books

Step-by-step explanation:

for 72 is 9

80=?

80÷72×9

=10 kg

72 is 9

?=6

=6÷9×72

48 books

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Answer 2

As given 72 books weigh 9kg.

Then find the average weight of a book.

= Total weight/Total books

= 9/72

= 1/8 kg or 0.125 kg

Hence weight of a single book is 0.125kg.

(a) Weight of 80 books = 80 × weight of single book

= 80 × 0.125

= 10 kg

(b) No. of books weighing 6 kg = 6 kg ÷ Weight of single book

= 6 ÷ 0.125

= 48 books.