You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.

Bobby has 142 books . Kristi has 78 books . How many more books does Bobby have than Kristi ?
64

Joan found 79 seashells on the beach , she gave Mike 63 of the seashells . How many seashells does she now have ?
16

Uncle Dave bought 143 ice cream sandwiches . If he wants to give them to his 11 hungry nieces , how many can each niece get ?

13