Marcus jogged 3.5 miles on Monday, 3.8 miles on Tuesday, and 4.5 miles on Wednesday. If he jogged a total of 15 miles from Monday through Thursday, how far did he jog on Thursday? Explain the steps you use to solve.

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