Raju can finish a piece of work in 20 days. He worked at it for 5 days and then Jakob alone finished the remaining work in 15 days. In how many days can both finish it together?

A. 10 days

B. 12 days

C. 16 days

D. 20 days

Answer: Option A

Solution(By Examveda Team)

Let total work = 60 unit
Work by Raju in one day = $$\frac{{60}}{{20}}$$ = 3 unit
5 days → 5 × 3 = 15 unit
Remaining work = 60 - 15 = 45 unit
15 days → 45 unit
1 day → 3 unit (Jakob)
Work done by Raja and Jakob in one day = 3 + 3 = 6
Time = $$\frac{{60}}{6}$$ = 10 days