WBCS.LIVE practice question

A can complete a work in 9 days when B can complete the same work in 6 days. They can complete the work in 3 days if C joins them. How many days will C take if C is told to complete the work alone?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. In 15 days
  2. In 12 days
  3. In 21 days
  4. In 18 days

Correct answer and explanation

Correct answer: In 18 days

Explanation: āœ… Correct Answer: D. In 18 days šŸ“š Explanation: The combined efficiency of A, B, and C is 1/3. Individually, A's rate is 1/9 and B's is 1/6. By subtracting (1/9 + 1/6) from 1/3, we find C's rate. The calculation 1/3 - 5/18 results in 1/18. Therefore, C would take exactly 18 days to finish the entire task working alone.