Multiple choice

A can finish a work in 20 days, B in 30 days and C in 12 days. A and B started the work, but are forced to leave after 5 days. In how many days C alone can finish the remaining work?

  1. 7

  2. 6

  3. 8

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

Combined rate of A+B = 1/20+1/30 = 1/12. In 5 days, they complete 5/12 work. Remaining 7/12 is done by C at 1/12 rate, taking 7 days.

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