Annette needs 20 gallons of water with a 3.5% salt concentration for her fish tank. She has a 2% salt solution and a 10% salt solution. How many gallons of each solution does she need for her tank?
+37157 x = 3.5% solution amount
20-x = 2% amount
salt content of ingredients = salt content of final solution
3.5% (x) + 2% (20-x) = 10% (20)
.035 x + .02 (20-x) = .1 (20) solve for "x" the amount of 3.5% then the amount of 2% = 20-x gallons
