Question

A is 60% as efficient as B, and C is 50% as efficient as
A. If A, B, and C working together can finish a task in 15 days, how many days will it take for B to complete the same task on his own?

A 22.5 days
B 25 days
C 28.5 days
D 32.5 days
E 37.5 days
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