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A and B can do a piece of work in 12 days. B and C in 15 days. C and A in 20 days. A alone can do the work in ?

Correct Answer: 30 days

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Math MCQ: A and B can do a piece of work in 12 days. B and C in 15 days. C and A in 20 days. A alone can do the work in ? | Extra Education