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A can do a work in 10 days and B in 20 days. If they together work on it for 5 days, then the fraction of the work that is left is ?

Correct Answer: 1/4

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Math MCQ: A can do a work in 10 days and B in 20 days. If they together work on it for 5 days, then the fraction of the work that is left is ? | Extra Education