LIVE Course for free

Rated by 1 million+ students
Get app now
Class 8 Foundation Course
Class 9 Foundation Course
Class 10 Foundation Course
Class 11 Foundation Course
Class 12 Foundation Course
JEE COURSE
NEET COURSE
0 votes
40 views
in Aptitude by (30.0k points)
closed by
The average age of a class of 12 students is 24. What is the average age of class when two students of age 22 and 23 leave the class?
1. 22.05 yrs
2. 24.3 yrs
3. 27.5 yrs
4. 26 yrs

1 Answer

0 votes
by (54.3k points)
selected by
 
Best answer
Correct Answer - Option 2 : 24.3 yrs

Given:

Total student = 12

Average age = 24 years

The age of the student who left the class = 22 and 23 years

Formula used:

Average = The sum of all student age/Total number of student

Calculation:

Average = The sum of all student age/Total number of student

⇒ 24 = The sum of all student age/12

⇒ The sum of all student age = 288

According to the question,

The sum of the ages of student who left the class = 22 + 23

⇒ The sum of the ages of student who left the class = 45

Now,

The age of remaining students = 288 - 45

⇒ The age of remaining students = 243

The number of remaining student = 10

New average,

Average = 243/10

⇒ Average = 24.3 

∴ The new average of the class is 24.3 years.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...