Final answer:
The solution to the inequality 15 + x ≤ 24 is x < 9.
Step-by-step explanation:
To solve the inequality 15 + x ≤ 24, we need to isolate the variable x.
Subtracting 15 from both sides of the inequality, we have x ≤ 9.
Therefore, the solution to the inequality is x < 9.