1.

A alone can do a piece of work in 20 days while B takes 16 days to do it by himself. It takes them 8 days to complete the work together with C. If C and D can work in 60 days, then how many days will D need to complete the work by himself?

A. 252
B. 225
C. 240
D. 270
Answer» D. 270


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