If 15 person can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

If 15 person can do a job in 30 days, then 30 persons with twice the e

1.	If 15 person can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?
A.	7
B.	3.5
C.	5
D.	7.5
Answer» E.

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If 15 person can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

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