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A and B can do a piece of work in 10 days, B and C in 15 days and C and A in 20 days. C alone can do the work in :

A60 days

B80 days

C120 days

D30 days

Answer:

C. 120 days

Read Explanation:

A+B+C -------->13/2 A+B-------->6 efficiency of C---->1/2


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