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]: The schools debate team had 28 boys and 4 girls on it . If they were split into groups of 4 how many groups could they make ?
[EX A]: 8

[EX Q]: Heather weighs 87 pounds . Emily weighs 9 pounds . Elizabeth weighs 8 pounds . How much heavier is Heather than Emily ?
[EX A]: 78

[EX Q]: There are 48 pencils and 40 scissors in the drawer . Joan placed 29 pencils in the drawer . How many pencils are now there in all ?
[EX A]:
77