SOLUTION: how much water must be added to 700 mL of 50% salt solution in order to obtain a 20% salt solution?

Question 1133156: how much water must be added to 700 mL of 50% salt solution in order to obtain a 20% salt solution?
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
Choose something other than "salt solution". Salt (sodium chloride) is just not soluble enough in water to be 50%.

Ignoring that but accepting the given values, the algebra you could use can start with

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