1. Let's clarify the problem you are referring to, which seems to involve a correction from 25 to 15. 2. If the problem involves a calculation or value originally stated as 25, and you indicate it should be 15, we need to understand the context to assist properly. 3. Please provide the full problem or equation where the value 25 was replaced by 15. 4. Once the full problem is given, we can solve it step-by-step including the corrected value 15.