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.

[EX Q]: Anne weighs 67 pounds . Douglas weighs 52 pounds . How much heavier is Anne than Douglas ?
[EX A]: 15

[EX Q]: Ezra drew a white line that was 7.666666666666667 inches long . Then he drew a blue line that was 3.3333333333333335 inches long . How much longer was the white line than the blue line ?
[EX A]: 4.333333333333333

[EX Q]: Tom went to 4 hockey games this year , but missed 7 . He went to 9 games last year . How many hockey games did Tom go to in all ?
[EX A]:
13