In Class I there are 12 students of average age 20 years, and in Class II there are 16 students of average age 23 years. What is the average age (approximately) of both the classes?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 21.7 years.
Total age for Class I = 12 × 20 = 240 years
Total age for Class II = 16 × 23 = 368 years
Total students = 12 + 16 = 28
Total age = 240 + 368 = 608 years
Average_age = 608/28 ≈ 21.7 years [approx]