You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
--------
Question: if 1 cartridge costs 15 dollars how many ink cartridges can you buy with 180 dollars ?

Answer: 12

Question: melissa scored 120 points in each game . how many points did she score in 10 games ?

Answer: 1200

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

Answer:
22