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P and Q can complete a work in 20 days and 12 days respectively. P alone started the work and Q joined him after 4 days till the completion of the work. How long did the work last? | |
A. | 5 days [Wrong Answer] |
B. | 10 days [Correct Answer] |
C. | 15 days [Wrong Answer] |
D. | 12 days [Wrong Answer] |