Shelby was having a movie party for her birthday. She and her mom made a dozen bags of buttered popcorn and 10 bags of caramel popcorn. Her brother Alan took 3 bags of buttered popcorn and 1 bag of caramel popcorn for his friends. How many bags of popcorn does Shelby have left for the party?
Shelby and her mom made 12 bags of buttered popcorn + 10 bags of caramel popcorn = <T>add(12, 10)=22 bags.
Of those 22 bags, her brother took 3 bags of buttered popcorn + 1 bag of caramel popcorn = <T>add(3, 1)=4 bags.
So now Shelby has 22 bags – 4 bags = <T>subtract(22, 4)=18 bags of popcorn left.
