Multiple choice

A can do a piece of work in 4 days, B in 12 days and C in 6 days. If A is assisted by both B and C on every third day, the total work can be done in-

  1. 6 days

  2. 3 days

  3. 5 days

  4. 4 days
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Work rates: A = 1/4, B = 1/12, C = 1/6 per day. Pattern: A works alone days 1-2, A+B+C work day 3. Each 3-day cycle: 2(1/4) + (1/4 + 1/12 + 1/6) = 5/6. After 2 cycles (6 days): 5/6 done. Day 7: A alone completes remaining 1/6. Option A (6 days) misses the final day.

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