Lisa went to the hardware store and bought 12 pieces rope. each rope was 3 4 of a meter long. if the rope cost $3.50 a meter, how much did she spend?

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