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If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

40 30 45 60

Your Answer

take work arbitrarily 60. a+b -->60/15=4 unit/day b-->60/20=3 unit/day a-->4-3=1 unit/day so for 60unit a will take 60 days

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