SOLUTION: How many gallons of a 12%-salt solution must be mixed with 6 gallons of a 20%-salt solution to obtain a 15%-salt solution?

Question 885658: How many gallons of a 12%-salt solution must be mixed with 6 gallons of a 20%-salt solution to obtain a 15%-salt solution?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Gallons? Percents 12, 20, 15? What are the densities of these concentrations? What form of percent is meant?

In clearer wording, the two kinds of information you must first be given are the densities of the solutions and how the percent concentrations are expressed: weight per weight, or weight per volume. These pieces of information may be necessary. Without them, the problem description is incomplete.

One could ignore densities and the kind of percentages meant, but this would only be a bad estimate of the truthful answer.
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