Question : The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. The average of the remaining students is:
Option 1: 14 years
Option 2: 12 years
Option 3: 11 years
Option 4: 13 years
New: SSC CHSL Tier 2 answer key released | SSC CHSL 2024 Notification PDF
Recommended: How to crack SSC CHSL | SSC CHSL exam guide
Don't Miss: Month-wise Current Affairs | Upcoming government exams
Correct Answer: 12 years
Solution :
The average of 30 students = 12
$\therefore$ The sum of the ages in a class = 30 × 12 = 360
The sum of ages of the first group = 10 × 5 = 50
The sum of ages of the second group = 14 × 5 = 70
So, the sum of ages of remaining students = 360 – (70 + 50) = 240
$\therefore$ The average age of the remaining 20 students = $\frac{240}{20}$ = 12 years
Hence, the correct answer is 12 years.
Related Questions
Know More about
Staff Selection Commission Combined High ...
Result | Eligibility | Application | Admit Card | Answer Key | Preparation Tips | Cutoff
Get Updates Brochure
Your Staff Selection Commission Combined Higher Secondary Level Exam brochure has been successfully mailed to your registered email id “”.
Upcoming Exams
Trending Articles around SSC CHSL
