A is able to complete a task in 15 days, while B takes 20 days to finish the…
2025
A is able to complete a task in 15 days, while B takes 20 days to finish the same task. If they collaborate and work together for 4 days, what fraction of the work will still remain?
- A.
1/3
- B.
7/15
- C.
8/15
- D.
4/9
Attempted by 4 students.
Show answer & explanation
Correct answer: C
1. (A+B)'s 1 day work = 1/15 + 1/20 = 7/60. 2. 4 days work = 4 * 7/60 = 28/60 = 7/15. 3. Remaining = 1 - 7/15 = 8/15.