A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?

A. 70
B. 50
C. 40
D. 60
✅ The correct answer is option D. 60.
Amount of work done by A and B in 1 day = 1/30

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