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
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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:
- 1$${8\over 15}$$true
- 2$${7\over 15}$$false
- 3$${1\over 4}$$false
- 4$${1\over 10}$$false
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