Jordan's car used 4 gallons of gas to drive 78 miles. At what rate does his car use gas in miles per gallon? Express your answer in simplest form.

(?) miles per gallon

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.