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

A +B = 15 days
B alone = 20 days ( taking LCM of 15 n 20 the rate per day of A n B toghether is 4 while that of B alone is 3, so A's rate per day is 4-3 = 1)
therefore, A alone will take 60 days to complete the work.

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