Multiple choice

A and B together can do a piece of work in 6 days. If A alone can do the work in 18 days, then the number of days required for B to finish the work is

  1. 10

  2. 12

  3. 9

  4. 15
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1/A + 1/B = 1/6. Given 1/A = 1/18. So 1/B = 1/6 - 1/18 = 3/18 - 1/18 = 2/18 = 1/9. Thus B takes 9 days.

AI explanation

Using the standard work formula, 1/B = 1/A + 1/B - 1/A, which means B's one day work is 1/6 - 1/18 = 2/36 = 1/9. Therefore, B alone can finish the work in 9 days.

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