Jimmy has a pocket full of nickels and quarters. their are a total of 40 coins. when he added it all up he had $5.20. how many nickels did he have?

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?