SOLUTION: 7l of an acid solution was mixed with 3l of a 15% acid solution to make a 29% acid solution. What is the percent concentration of the first solution?

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Question 795682: 7l of an acid solution was mixed with 3l of a 15% acid solution to make a 29% acid solution. What is the percent concentration of the first solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let h = the percent concentration for the first solution. This is your only unknown variable.

L = 15% acid
T = 29% acid, what results
U = 3 liters of the 15% acid
V = 7 liters of the unknown h % acid

highlight%28%28LU%2BhV%29%2F%28U%2BV%29=T%29
SOLVE FOR h.