SOLUTION: How many gallons of a 4% salt solution must be mixed with 50 gallons of a 26% solution to obtain a 15% solution?

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Question 791515: How many gallons of a 4% salt solution must be mixed with 50 gallons of a 26% solution to obtain a 15% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
With concentrations of 26% and 15%, this can only be approximate, like an estimation until you take care of the densities.

You have something close to this:
%2850%2A26%2Bv%2A4%29%2F%28v%2B50%29=15
Solve for v.