Question
A can complete a piece of work in 12 days , and B can
complete it in 18 days . They work together for 4 days , and then A leaves. In how many more days  will B finish the remaining work?Solution
Assume total work = LCM(12, 18) = 36 units A’s rate = 36/12 = 3 units/day B’s rate = 36/18 = 2 units/day Work done in 4 days together: = (3 + 2) × 4 = 5 × 4 = 20 units Remaining work = 36 − 20 = 16 units B alone does 2 units/day: Time = 16 / 2 = 8 days
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