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]: Jason has 3 Pokemon cards . Benny bought 2 of Jason 's Pokemon cards . How many Pokemon cards does Jason have now ?
[EX A]: 1

[EX Q]: John made 6 dollars mowing lawns and 18 dollars weed eating . If he only spent 3 dollar a week , how long would the money last him ?
[EX A]: 8

[EX Q]: Katie was selling her necklaces at a garage sale . She sold 4 bead necklaces and 3 gem stone necklaces . If each necklace cost 3 dollars , how much money did she earn ?
[EX A]:
21