Question

If 20 people can build 45 metres of wall in 5 days what is the height of the wall built by the same number of people in 3 days?​

Answer 1

45 m of wall is made in 5 days

M of wall made in 1 day= 45÷5

=9m

Height of wall made in 3 days=9×3=27m

Answer 2

No. of people = 20

They built 45 metres in 5 days.

So they built $\frac{45}{5}$ metres in 1 day

i.e. They built 9 metres in 1 day.

So, 3 days work is 3 x work of 1 day

⇒ 3 x 9

⇒ 27 metres.

∴ Same number of people built 27 metres of wall in 3 days.

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