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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 [Wrong Answer] |
B. | 50 [Wrong Answer] |
C. | 40 [Wrong Answer] |
D. | 60 [Correct Answer] |