Multiple choice

The work done by A in one day is half of the work done by B in one day. The work done by B is half of the work done by C in one day. If C alone can complete the work in 7 days, in how many days will A, B and C together complete the work?

  1. 28 days

  2. 14 days

  3. 4 days

  4. 21 days

  5. 8 days
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work done by C in one day = 1/7 Work done by B in one day = 1/2(C) = 1/7 x 1/2 = 1/14 Work done by A in one day = 1/2(B) = 1/2 x 1/14 = 1/28 Work done by A, B and C together in one day = (4 + 2 + 1)/28 = 1/4 Work is done by A, B and C together in 4 days.

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