SOLUTION: how much of a(n) 90% orange juice drink must be mixed with 12 gallons of a 20% orange juice drink to obtain a mixture that is 50% orange juice

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Question 810838: how much of a(n) 90% orange juice drink must be mixed with 12 gallons of a 20% orange juice drink to obtain a mixture that is 50% orange juice
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.9x+.2(12)=.5(x+12)
x=9 gallons