A person X working alone can complete a work in 5 days.
A person X working alone can complete a work in 5 days. A person Y completes the same amount of work in 20 days, and a person Z when working alone can complete the same amount of work in 30 days. All three people work together for 2 days but then X and Y leave. How many more days does Z need to complete the work after X and Y leave?
Answer/Solution
13
Steps/Work
The fraction of work completed in two days is 2/5 + 2/20 + 2/30 = 17/30
The fraction of work remaining is 1 - 17/30 = 13/30
The number of days required for Z is 13 days.
The answer is A.
The fraction of work remaining is 1 - 17/30 = 13/30
The number of days required for Z is 13 days.
The answer is A.