Multiple choice

A man is twice as efficient as a woman and a woman is twice as efficient as a boy in doing a work. If all of them can finish the work in 7 days, then in how many days will the boy finish the work alone?

  1. 49

  2. 7

  3. 6

  4. 42
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let boy efficiency = 1. Woman = 2, Man = 4. Total = 7 units/day. Total work = 7 * 7 = 49 units. Boy takes 49 / 1 = 49 days.

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