Question

$15$ men can build a wall in $60$ days. How many more men are required to build another wall of same size in $45$ days?

• A. $2$ men
• B. $7$ men
• C. $5$ men
• D. $3$ men

Answer 1

The correct option is C $5$ men

Let $x$ men are required to build the wall in $45$ days.

Then $x:15::60:45$

$\Rightarrow 45x=15\times 60$

$\Rightarrow x=\frac{15\times 60}{45}$

$x=20$ men.

Hence, $20-15=5$ more men are required.