Miguel and three of his friends went to the movies. They originally had a total of $40. Each boy had the same amount of money and spent $7.50 on a ticket. How much money did each boy have left after buying his ticket?
A. Draw a bar diagram that represents the situation.
B. Write and solve an equation that represents the situation.
C. Explain how you solved your equation.
D. Compare the arithmetic solution and the algebraic solution.