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X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ? | |
A. | 6 days [Wrong Answer] |
B. | 10 days [Correct Answer] |
C. | 15 days [Wrong Answer] |
D. | 20 days [Wrong Answer] |