Henry is making a display board for a project. The board is a 10ft by 6ft rectangle. He needs to add a ribbon border around the entire display board. What is the length of ribbon that he needs?

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