Question

If $36$ men can do a piece of work in $25$ days, in how many days will $15$ men complete the same work?

Answer 1

$\to$ If 36 men can do the work

In 25 days, 1 man could do

it in $25\times 36$ days

$\Rightarrow$ 1 man can do ${\frac{1}{25\times 36}}^{th}$ of the

work in 1 day

$\Rightarrow$ 15 man could do ${\left(\frac{15}{25\times 36}\right)}^{th}$

of the work in 1 day

$\Rightarrow$ It would take $\frac{25\times 36}{15}=60$

days for them to complete

the work