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 will be the approximate average age for all the students of these two classes?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 21.7 years
Class I:
12 students Average age = 20 years
Class II:
16 students Average age = 23 years
Class I: 12 × 20 = 240 years
Class II: 16 × 23 = 368 years
Total students = 12 + 16 = 28
Total age = 240 + 368 = 608
Average age = 608/28 ≈ 21.7