The average age of a teacher and three students is 20 years. If all the three students are of same age and the difference between the age of the teacher and each student is 20 years, then what is the age of the teacher?
A
25 years
B
30 years
C
35 years
D
45 years
Correct Answer: Option C
Explanation
1. **Get the Total (The 'Step 0' of Averages):**
The first thing I recall from PYQ analysis (like 2017's r