A and B can finish a piece of work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days. A alone can finish the work in Choose the correct choice from the following options
A) 48 days
B) 50 days
C) 54 days
D) 60 days
E) 65 days
Explanation:   (A + B)’s 1 day’s work = 1/30   Their 20day’s work = 1/30 × 20 = 2/3   Remaining 1/3 work is done by A in 20 days   Therefore, A alone can finish the work in 3 × 20 = 60 days.   Answer: Option 60 days
<result>D</result>
A and B can finish a piece of work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days. A alone can finish the work in