You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
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Question: Mary is baking a cake . The recipe calls for 7 cups of flour and 3 cups of sugar . She already put in 2 cups of flour . How many cups of flour does she need to add ?

Answer: 5


Question: Dave had to wash 9 short sleeve shirts and 27 long sleeve shirts before school . If he had only washed 20 of them by the time school started , how many did he not wash ?

Answer: 16


Question: Emily collects 63 cards . Emily 's father gives Emily 7 more . Bruce has 13 apples . How many cards does Emily have ?

Answer:
70