A research team finishes a study in 90 days with 6 members. If 2 leave after 30 days, how many more days to complete the study?
Correct answer: B. 80
- A. 75
- B. 80
- C. 85
- D. 90
Explanation
The original team of 6 members can complete the study in 90 days, which totals to 540 member-days of work (6 members × 90 days). After 30 days, the team has completed 180 member-days (6 members × 30 days), leaving 360 member-days of work remaining. With 4 members left (after 2 leave), it will take 90 more days (360 member-days ÷ 4 members) to finish the study. Since 30 days have already passed, the project will be completed in a total of 80 more days. Therefore, Option B is correct. Options A, C, and D are incorrect due to errors in calculating the impact of the reduced workforce on the remaining work.
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