Multiple choice

A, B and C can complete the whole work in 12 days . C starts the work and works for z days and left , while A and B complete the remaining 7/12 th of the work in 14 days , then find the value of z ?

  1. 10

  2. 12

  3. 15

  4. 20

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

Combined work rate of A, B, C = 1/12 work per day. A and B complete 7/12 work in 14 days, so their rate = (7/12)/14 = 1/24 per day. Therefore, C's rate = (1/12 - 1/24) = 1/24 per day. C completed 5/12 work alone, so time = (5/12)/(1/24) = 10 days.

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