WBCS.LIVE practice question

X can do a piece of work in 20 days and Y can do it in 12 days. Y worked at it for 9 days. In how many days can X alone finish the remaining work?

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

Answer options

  1. 5
  2. 3
  3. 7
  4. 11

Correct answer and explanation

Correct answer: 5

Explanation: āœ… Correct Answer: A) 5 šŸ“š Explanation: Y can finish the work in 12 days, so in 9 days, Y completes 9/12 or 3/4 of the work. This leaves 1/4 of the total work remaining for X. Since X can do the whole work in 20 days, he will take 1/4 of that time for the remainder. Calculating 20 * (1/4) shows that X needs 5 more days to finish alone.