A and B together can complete a piece of work in 12 days, B and C can do it in 20 days and C and A can do it in 15 days. A , B and C together can complete it in.
A. 12 days
B. 6 days
C. 8 days
D. 10 days
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সঠিক উত্তরঃ
D.
10 days
Explanation:
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