You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division 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: Nancy picked 12 carrots from her garden . If she threw out 2 of them and then picked 21 more the next day , how many carrots would she have total ?

Answer: 31


Question: A waiter at ' The Greasy Spoon ' restaurant had 26 customers to wait on . During the lunch rush he added another 27 customers . If 27 of the customers did n't leave him a tip , how many customers did leave a tip ?

Answer: 26


Question: Isabel baked 3 brownies , but needed 5 total for her party . If she used 5 cups of flour on each one , how much cups of flour does she still need ?

Answer:
10