Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

mrs. hilt met 15 friends . 9 of the friends were carrying pears . the rest were carrying oranges . how many friends were carrying oranges ?
6

mrs. wong had 30 valentines . she gave 8 valentines to her children . how many does she have left ?
22

billy had 74 cherries . he ate 72 of them . how many cherries does billy have left ?
2