24 - Correct. C does double the work → C = 2 units/day, A = 1 → If C finishes in 12, total = 24 units → A = 1/day → 24 days.
Correct answer: A. 24
- A. 24
- B. 30
- C. 36
- D. 48
Explanation
The correct answer is 24 days. If C completes the work in 12 days at a rate of 2 units per day, the total work is 24 units. A works at a rate of 1 unit per day, so A will take 24 days to complete the same amount of work. Other options like 30, 36, and 48 days either overestimate or underestimate the time needed based on A's work rate. Always calculate based on the unit rate of work done per day.
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