A and B work together. A alone can complete the work in 18 days and B alone in 22 days. What percentage of the total daily work is contributed by A? MCQ with Answer and Explanation
A and B can complete a work in 10 days and 15 days respectively. They started together, but A left after some days and B finished the remaining work in 5 days. After how many days did A leave?
Explanation:
Total work = LCM(10, 15) = 30 units. Efficiency of A = 3, B = 2. B worked alone for 5 days: work done = 5 * 2 = 10 units. Remaining work = 30 - 10 = 20 units. This was completed by A and B together. Combined efficiency = 3 + 2 = 5 units/day. Time they worked together = 20 / 5 = 4 days. Thus, A left after 4 days.
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