40 men can complete a work in 15 days. Three days after they started working, 20 more men joined them. In how many days the total work will be completed?
Answer & explanation
Correct answer: option 3
40 men complete the work in 15 days
In 3 days, $\frac{1}{5}$ of the work is complete
20 more men join,
time taken to complete the remaining work,
using the following formula
$\frac{Men\; \times\; Days}{Work}$ = Constant
$\frac{40\; \times\; 15}{5}$ = $\frac{60\; \times\; days}{4}$
No. of days = 8
Total time taken to complete the work = 8 + 3 = 11 days