Question

If 15 men can complete a piece of work in 30 days, in how many days will 18 men complete it?

Answer 1

Since 15 men can complete a piece of work in = 30 days
$\therefore$ 1 man can do the work in $=30\times 15$ days
$\therefore$ 18 men can do the work in $=\frac{30\times 15}{18}=\frac{5\times 15}{3}$
$=5\times 5=25days$
Hence 18 men can do the work in 25 days.