The average age of 20 students in a class is 18 years. When a new student is admitted, the average increases by 1 year. What is the age of the new student?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 39.
Total age of 20 students = 20 × 18 = 360 years
New average (after 1 more student) = 19 years
Total age of 21 students = 21 × 19 = 399 years
Age of new student = 399 − 360 = 39 years