2025 실시 9월 모의고사 20번 고1

This is a math video covering Question 20 from the September 2025 Mock Exam (1st Year High School). I solved the problem while explaining it and interacting closely with the students. I solved it with genuine sincerity. I believe this video is distinct from those uploaded after mechanically solving problems. I hope this will be of great help to students retaking the exam on their own, students who want to achieve a Grade 1 on the CSAT without attending an academy, and instructors who are diligently researching. My content covers: Math mock exams, middle school math, high school math, CSAT math, military academy math, police academy math, middle school conceptual math, high school conceptual math, etc.