instruction:
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.
question:
A restaurant served 4 pies during lunch and 9 during dinner today . The restaurant served 7 pies and 2 pizzas yesterday . How many pies were served in total ?
answer:
20

question:
Allie counted the leftover ice cream after a sundae party . She had 0.3333333333333333 carton of rocky road ice cream , 0.3333333333333333 carton of cookie dough ice cream , and 0.16666666666666666 carton of strawberry cheesecake ice cream . How many cartons of ice cream did Allie have in all ?
answer:
0.8333333333333334

question:
Karen has 639 crayons . Cindy has 504 crayons . How many more crayons does Karen have than Cindy ?
answer:
135