SOLUTION: Please help me solve this mixture problem: How many gallons of a 60% alcohol solution must be mixed with 80 gallons of a 13% solution to obtain a solution that's 50% alcohol?

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Question 738969: Please help me solve this mixture problem:
How many gallons of a 60% alcohol solution must be mixed with 80 gallons of a 13% solution to obtain a solution that's 50% alcohol?

Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
How many gallons, v, of a H% alcohol solution must be mixed with u gallons of a L% solution to obtain a solution that's T% alcohol?

%28Lu%2BHv%29%2F%28u%2Bv%29=T

You only need to solve for v, one variable. Once this formula is obtained you substitute your given values for computing v.