Question

If 36 men can do a piece of work in 25 days, in how many day will 15 men do it?

Answer 1

Here less men, more days.
$\therefore$ Let in x days, 15 men can finish the work
Therefore,
$\begin{array}{ccc}\text{Men}& 36& 15\\ \text{Days}& 25& x\end{array}$
By inverse variation
36:15=x:25
$\frac{36}{15}=\frac{x}{25}\Rightarrow 15\times x=36\times 25\Rightarrow x=\frac{36\times 25}{15}=60$
$\therefore$ The work will be finished in 60 days