Students were asked to choose the city they would most like to visit. If 4/9 of students chose New York and 3/9 chose Los Angeles, what fraction chose either New York or Los Angeles?

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