How much water must be added to 60 liters of 60 percent alcohol mixture to reduce it to a mixture of 50 percent alcohol concentration? What if 30 percent alcohol mixture is added instead of water?

Answer 1

(60 * .6) + (x * 0) = (60 + x) * .5

(60 * .6) + (x * .3) = (60 + x) * .5