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P is able to do a piece of work in 15 days and Q can do the same work in 20 days. If they can work together for 4 days, what is the fraction of work left? | |
A. | 8/15 [Correct Answer] |
B. | 7/15 [Wrong Answer] |
C. | . 11/15 [Wrong Answer] |
D. | 2/11 [Wrong Answer] |