Mica is making a paste mixture for an art project. He mixes 8 cups of water with glue. If he wants to make a double batch, how many quarts of water does he need? How much water is that in gallons?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning