SOLUTION: How many liters each of a 50% acid solution and a 85% acid solution must be used to produce 70 liters of a 75% acid solution? (Round to two decimal places if necessary.)

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Question 1188472: How many liters each of a 50% acid solution and a 85% acid solution must be used to produce 70 liters of a 75% acid solution? (Round to two decimal places if necessary.)
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
v of 85%
70-v of the 60%

85v%2B50%2870-v%29=75%2A70
Simplify and solve.