Question : The average age of 30 students is 20 years and the average age of 20 other students is 30 years. The average age of the total number of students is:
Option 1: 24 years
Option 2: 25 years
Option 3: 48 years
Option 4: 50 years
Correct Answer: 24 years
Solution :
The average age of 30 students = 20 years
Total age of 30 students = 30 × 20 = 600 years
The average age of 20 students = 30 years
Total age of 20 students = 20 × 30 = 600 years
Hence, average age of total number of students = $\frac{600+600}{30+20} = \frac{1200}{50}= 24$ years
Hence, the correct answer is 24 years.
Related Questions
Know More about
Staff Selection Commission Multi Tasking ...
Answer Key | Cutoff | Selection Process | Preparation Tips | Eligibility | Application | Exam Pattern
Get Updates Brochure
Your Staff Selection Commission Multi Tasking Staff Exam brochure has been successfully mailed to your registered email id “”.
Upcoming Exams
Trending Articles around SSC MTS
