A deck of 20 cards is labeled 1 through 20. If a card is randomly drawn from the deck, what is the probability that the number drawn is even? a:1/4
b:5/20
c:1/2
d:11/20

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