Answer:
What are we looking to solve for?
How much each shirt she bought for the fundraiser costs, each.
What variable can be used to represent the unknown?
The variable "t".
What is the equation to solve the variable?
You can use the following equation as a framework for solving:
t * 22 = 231 solve for t.
Now lets solve:
I am going to use inverse operations: Divide instead of multiply.
231/22 = 10.05
Each shirt is worth $10.50.
Explanation:
Hope it helps! =D