The average age of 25 girls in a class is 11 2 years and that of the remaining 15 girls is 10 years ...........

Quantitative Aptitude (CPO) Average

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.

This questions was previously asked in

SSC CPO 10th Nov 2022 Shift 3

10.75 years

11.35 years

10.45 years

11.05 years

- We need to find the average age of all the girls in the class.

- The class has two groups: 25 girls with an average age of 11.2 years and 15 girls with an average age of 10 years.

- Calculate total age for each group:

- First group: 25 girls × 11.2 years = 280 years

- Second group: 15 girls × 10 years = 150 years

- Combine total age: 280 years + 150 years = 430 years.

- Find total number of girls: 25 + 15 = 40 girls.

- Calculate the average age of all the girls: 430 years ÷ 40 girls = 10.75 years.

- Option 1: 10.75 years is the correct answer

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