Multiple choice

A alone can complete a work in 15 days and B alone in 20 days. Starting with A, they work on alternate days. The total work will be completed in?

  1. 17

  2. 16

  3. 14

  4. 13

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A's daily work = 1/15, B's daily work = 1/20. In 2 days (A then B): 7/60 work done. After 8 cycles (16 days): 56/60 = 14/15 work. Remaining 1/15 is done by A on day 17.

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