Achef had 2 1/3 heads of lettuce. she used 2/3 head of lettuce to make a salad. how many heads of lettuce does she have left? show a number model and a estimate with your answer.

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.