instruction:
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.
question:
Roden went to a pet shop . He bought 15 gold fish and 7 blue fish . How many fish did he buy ?
answer:
22


question:
For Halloween Debby and her sister combined the candy they received . Debby had 32 pieces of candy while her sister had 42 . If they ate 35 pieces the first night , how many pieces do they have left ?
answer:
39


question:
Evelyn starts with 18 bottle caps . She finds another 63 . How many bottle caps does Evelyn end with ?
answer:

81