I don't get it? -confusion.

Anabel uses 10 gallons of gas to drive 220 miles on the highway. if she travels at the same rate, how many miles can she drive on 7 gallons of gas

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

It says factor each expression 49x-28?