Multiple choice

A and B can complete the some work in 12 and 15 days respectively. They started working together but 3 days before the completion of the work B leaves the work. Find in how many days the work will be completed?

  1. 8

  2. 7

  3. 6

  4. 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let total work be 60 units. A's rate = 5 units/day, B's rate = 4 units/day. B leaves 3 days before completion, so A works alone for 3 days, completing 15 units. Remaining 45 units done together at 9 units/day = 5 days. Total = 5 + 3 = 8 days.

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