Answer: 7 bags of popcorn
Step-by-step explanation: In this problem, we know that Katie sold 35 bags of popcorn and she sold 5 times as many as Aaron.
We can find out how many bags of popcorn Aaron sold by dividing the number of bag of popcorn that Katie sold by 5.
35 ÷ 5 = 7
This means that Aaron sold 7 bags of popcorn for the fundraiser.