Harold has 3 pounds of red apples and 4.2 pounds of green apples from blue star grocery, where both kind of apples are $1.75 a pound. how much did harold spend on apples?

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