7. 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
(a) 0.5
(b) 1
(c) 1.25
(d) 1.5
(e) 2
