SOLUTION: An 80% fruit juice concentrate is to be mixed with water to produce 10 gallons of a 20% fruit juice mixture. How much of each is needed?

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Question 841678: An 80% fruit juice concentrate is to be mixed with water to produce 10 gallons of a 20% fruit juice mixture. How much of each is needed?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
The water contains 0% juice. This is just a dilution.

u = how much water to use
v = how much of the 80% juice to use

80%2Av%2F10=20 and u%2Bv=10