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A and B finish a job in 12 days, while A, B, and C finish in 8 days. How many days will C alone take?

A. 20 days
B. 24 days
C. 28 days
D. 30 days
Correct Answer: B. 24 days
Explanation: Work of A+B in 1 day = 1/12, A+B+C in 1 day = 1/8 → C’s work = 1/24 → C alone = 24 days.

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