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1. |
A, B, and C can complete a task together in 10 days. A and B would need 12 days, while B and C would take 20 days. If B worked alone, how many days would he take to complete the task? |
A. | 22 |
B. | 45 |
C. | 30 |
D. | 20 |
Answer» D. 20 | |