Multiple choice

Mahesh is four times as efficient as Suresh. If Mahesh can complete a piece of work in 21 days less than Suresh, then in how many days can Mahesh alone complete the piece of work?

  1. 7

  2. 14

  3. 21

  4. 28
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A Correct answer
Explanation

Efficiency ratio 4:1 means time ratio is 1:4. Let Mahesh take x days, Suresh takes 4x days. Then 4x - x = 21, so 3x = 21 and x = 7. Mahesh alone takes 7 days.

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