Question

15 men can build 16.5 metre length wall in one day . how many men are required to build 66 metre long wall in one day?

Answer 1

Let the number of men required be x.
15 : 16.5 = x : 66
x= 15 * 66 / 16.5 = 60.
Thus, 60 men will be required to build a wall in the same time but a 66 m tall wall.

Answer 2

Men required to build 66 metre long wall in one day =
$66 \times 15 \div 16.5$
= 60 mens