Randall opened a lemonade stand. He spent $3.50 on lemons, water, and sugar. He spent another $2.00 on cups. Randall sold 15 cups of lemonade for $0.50 each. Which number line could Randall use to compare the amount of money he collected with the amount he spent?

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