Question

'A' and 'B' can do a piece of work together in 30 days. They worked together for 18 days, and then left the work. The remaining job was finished by 'C' alone in 12 days. How many days would 'C' alone take to finish 72% of the whole work?

A 21.6 days
B 10.5 days
C 17.5 days
D 31.2 days
E None of these
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