Inequalities on the Number Line — Visualization and Examples

Devin and Ethan met a fairy who told them "If you have less than 15 dollars, then I will give you cake". Both Devin and Ethan have an integer amount of money and Devin has $5$ dollars more than Ethan. If only Ethan got the cake, then how many different amounts of money could Ethan have had?

Source: Lexington Math Tournament