SOLUTION: a 20% paint thinner solution is mixed with a 60% paint thinner solution to produce 4 gallons of a 50% paint thinner solution. how many gallons of each solution are needed?

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Question 1049376: a 20% paint thinner solution is mixed with a 60% paint thinner solution to produce 4 gallons of a 50% paint thinner solution. how many gallons of each solution are needed?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
L and H how much gallons of each Low and High concentrations.

system%28%2820L%2B60H%29%2F4=50%2CL%2BH=4%29