The capacity of an automobile cooling system is 16 quarts it is half full of 15 percent anti-freeze solution the owner is adding 2 gallons of 90 percent solution when he’s finished what will the solutions percentage value be

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters