Question

Ten men take 4 days to complete the task of tarring a road. How many days would 8 men take?

Answer 1

Given :
$\begin{array}{cc}\text{Number of men}& \text{Number of days}\\ 10& 4\\ 8& x\end{array}$

More the men lesser the number of days required to finish the work.

So, the Number of men and the number of days required to complete the work are inversely proportional to each other.

$\frac{10}{8}=\frac{x}{4}$
$\Rightarrow x=\frac{10\times 4}{8}$
$\Rightarrow x=5$
Thus, when 8 men are involved so, 5 days will be required.