Question

Fifteen men can build a wall in 60 days. How many more men are required to build another wall of same size in 45 days?

Answer 1

In 60 days a wall can be built by = 15 men
In 1 day a wall can be built by $=15\times 60$ men
In 45 days a wall can be built by $=\frac{15\times 60}{45}$
$=\frac{900}{45}=20men$
$\therefore$ No. of more men required to build the wall in 45 days = 20 - 15 = 5 men.