A is twice as efficient as B, who is thrice as efficient as C. If C alone can complete the task in 30 days, then in how many days can they together complete the task?

A is twice as efficient as B, who is thrice as efficient as C. If C al

1.	A is twice as efficient as B, who is thrice as efficient as C. If C alone can complete the task in 30 days, then in how many days can they together complete the task?
A.	3
B.	4
C.	5
D.	6
Answer» B. 4

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A is twice as efficient as B, who is thrice as efficient as C. If C alone can complete the task in 30 days, then in how many days can they together complete the task?

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