SOLUTION: 3 L of an acid solution was mixed with 7 L of a 20 % acid solution to make a 41 % acid solution . Find the percent concentration of the first solution.

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Question 783786: 3 L of an acid solution was mixed with 7 L of a 20 % acid solution to make a 41 % acid solution . Find the percent concentration of the first solution.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Make the rational equation which describes the two part mixture.

(amount of acid)/(amount of mixture)=fraction as acid.

Let h = the percent concentration of the unknown acid solution.
%283h%2B7%2A20%29%2F%283%2B7%29=41
Solve for h.