Five hundred customers were asked to rate a service on a scale of 1 (terrible) to 5 (perfect). results are below: number of customers; score 75; 5 105; 4 200; 3 105; 2 15; 1 what was the average rating of the service?

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