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A can do a piece of work in 15 days and B in 20 days. If they together work it for 4 days, then the fraction of the work that is left is:5
Q: A can do a piece of work in 15 days and B in 20 days. If they together work it for 4 days, then the fraction of the work that is left is:
- 1true
- 2false
- 3false
- 4false
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