Question

If 40 men can finish a piece of work in 60 days, in how many days will 75 men finish the same work?

Answer 1

40 men can finish the work in 60 days.
1 man can finish the work in 60 $\times$ 40 days. [Less men, more days]
75 men can finish the work in $\frac{60\times 40}{75}=32\mathrm{days}$

Hence, 75 men will finish the same work in 32 days.