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.

[Q]: Tom found 7 seashells but 4 were broken . How many unbroken seashells did Tom find ?
[A]: 3


[Q]: Suzie found 2 worms in the yard and measured them with a ruler . 1 worm was 0.8 inch long . The other worm was 0.1 inch long . How much longer was the longer worm ?
[A]: 0.7


[Q]: John was trying to expand his game collection . He bought 21 games from a friend and bought 8 more at a garage sale . If 23 of the games did n't work , how many good games did he end up with ?
[A]:
6