How many additional gallons of orange juice must be mixed in to make the orange juice 60% of the soft drink?

One gallon of soft drink is made of 40% orange juice and 60% water, how many additional gallons of orange juice must be mixed in to make the orange juice 60% of the soft drink?
A. 0.5
B. 1
C. 1.25
D. 1.5
E. 2

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