SOLUTION: How many litters of a 70% acid solution must be added to 14 liters of a 20% acid solution to produce a 35% acid solution

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Question 755890: How many litters of a 70% acid solution must be added to 14 liters of a 20% acid solution to produce a 35% acid solution
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = volume liters of the 70% acid to use.

Resulting volume of solution is v+14 liters.

%2870v%2B20%2A14%29%2F%28v%2B14%29=35
Solve for v.

70v%2B20%2A14=35v%2B35%2A14
%2870-35%29v=35%2A14-20%2A14=%2835-20%29%2A14
You finish!