Question

A work can be completed by ‘A’ and ‘B’, alone in 18 days and 12 days, respectively. Find the number of days taken by ‘C’ to complete the same work alone if ‘A’, ‘B’ and ‘C’ together can complete the whole work in 4 days. 

A 9 days
B 8 days
C 7 days
D 5 days
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