A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is
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Question:A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is
1.1/4
2.1/10
3.1/15
4.8/15
Answer:4