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.

[EX Q]: Gary had 73 dollars . He spent 55 dollars on a pet snake . How many dollars did Gary have left ?
[EX A]: 18

[EX Q]: A pet store had 36 siamese cats and 18 house cats . During a sale they sold 26 cats . How many cats do they have left ?
[EX A]: 28

[EX Q]: In Mr. Olsen 's mathematics class , 0.7 the students received A 's and 0.2 received B 's . What fraction of the students received either A 's or B 's ?
[EX A]:
0.9