Question

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

Answer 1

Answer:

if the weight of 72 books is 9 kg

then the weight of 1 books = 72/9

=8

now the weight of 40 kg= 40/8

= 5 kg

Answer 2

Step-by-step explanation:

Weight of 72 books = 9 kg

.: By direct proportion,

72 40

------ = ------

9 x

72 × x = 9 × 40

72x = 360

x = 360

--------

72

x = 5 kg

.: Weight of 40 books is 5 kg

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