How many gallons of a 60% orange juice solution and how many gallons of a 40% orange juice solution should be mixed together to produce four gallons of 45% orange juice solution?
a) 2 gallons of 60% orange juice and 2 gallons of 40% orange juice
b) 3 gallons of 60% orange juice and 1 gallon of 40% orange juice
c) 1 gallon of 60% orange juice and 3 gallons of 40% orange juice
d) 4 gallons of 60% orange juice and 0 gallons of 40% orange juice