In a certain game, the units of currency of three countries are the crown, the shield, and the pound, respectively. if 2 crowns equal 3 shields and 3 shields equal 4 pounds, how many crowns equal 18 pounds?

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