Mr. Jackson went shopping. He bought an umbrella for $15. He also bought 3 shirts, each of which cost the same amount. Altogethe
r he spent $52.50. Part A: Write an equation to represent this situation, using s to represent the cost of one shirt. (Assume there is no sales tax where Mr. Jackson lives.)
Equation: __________________
Part B: What was the cost of one shirt? Show your work.