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.
Q: mary 's mom is getting ready for mary 's birthday party . she blew up 6 balloons this morning and 5 balloons this afternoon . how many balloons did she blow up in all ?
A: 
11