Question

If $5$ men can build a wall in $12$ days. How many men can build it in $10$ days?

• A. $6$
• B. $7$
• C. $8$
• D. $4$

Answer 1

The correct option is A $6$

Let total work be W, and work done by 1 man in 1 day be w, then

$5\times w\times 12=W$

Also,

$x\times w\times 10=W$ ( where x is number of men required to build the wall in 10 days)

Equating both equations, we get,
$x\times w\times 10=5\times w\times 12$

$\Rightarrow x=\frac{60}{10}=6men$