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

Let wrk = lcm of 15 n 20 dat is 60 B efficiency = 60/20=3 A+B efficiency = 60/15=4 A efficiency = 4-3=1 So A can do wrk alone in 60/1=60 days

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