2 Views

Question : The average age of 25 girls in a class is 11.2 years and that of the remaining 15 girls is 10 years. Find the average age of all the girls in the class.

Option 1: 10.75 years

Option 2: 11.35 years

Option 3: 10.45 years

Option 4: 11.05 years


Team Careers360 1st Jan, 2024
Answer (1)
Team Careers360 17th Jan, 2024

Correct Answer: 10.75 years


Solution : The total age of the 25 girls = 25 × 11.2 = 280 years
The total age of the remaining 15 girls = 15 × 10 = 150 years
So, the total age of all the girls = 280 + 150 = 430 years
The total number of girls = 25 + 15 = 40
Therefore, the average age of all the girls in the class = $\frac{430}{40}$ = 10.75 years
Hence, the correct answer is 10.75 years.

Know More About

Related Questions

TOEFL ® Registrations 2024
Apply
Accepted by more than 11,000 universities in over 150 countries worldwide
Manipal Online M.Com Admissions
Apply
Apply for Online M.Com from Manipal University
View All Application Forms

Download the Careers360 App on your Android phone

Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile

150M+ Students
30,000+ Colleges
500+ Exams
1500+ E-books