SOLUTION: How much of an 80%-salt solution must be mixed with 30 gallons of a 13%-salt solution to obtain a solution that is 70% salt?

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Question 823652: How much of an 80%-salt solution must be mixed with 30 gallons of a 13%-salt solution to obtain a solution that is 70% salt?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
NO, NO, NO! There is no 80% salt solution; there is no 70% salt solution. Is this sodium chloride in water, or is this something else? In sodium chloride, then impossible.