1) Assume you know that your car travels a certain number of miles on a gallon of gas. Explain how you would determine how much gas you would need to traveldmiles.

2)

Giorgio has 25 marbles, 5 of which are blue. Rodrigo has 85 marbles, 17 of which are blue. The ratio of blue marbles to total marbles is equivalent for Giorgio and Rodrigo. They each received 5 more marbles, none of which are blue. Determine if the ratios are still equivalent. Explain.