A 120-liter solution that is 5% salt is mixed with an80-liter solution that is 15% salt. The combined solution is what percent salt?

120 + 80 = 200 liters final solution

salt of ingrediaents = salt in final solution

.05 (120)   +   .15(80) =  ? (200)         solve for ?    which is the final solution percentage (in decimal form)