Originally Posted by

**tami-chan87** A saline solution is 20% salt. How many gallons of water must be added to dilute the mixture to 8 gals of a 15% saline solution?

Usually with word problems I would try to make 2 equations, solve one for a variable, then substitue that variable in the other equation and then solve for the remaining variable. However, I have a hard time coming up with an equation for this problem because I feel like there's not enough informtation. Don't I at least need to know how many gallons were there at the beginning?

Any help is appreciated...