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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.
  • a)
    10.75 years
  • b)
    11.35 
    years
  • c)
    10.45 
    years
  • d)
    11.05 
    years
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The average age of 25 girls in a class is 11.2 years and that of the r...
Given:
The average age of 25 girls in a class is 11.2 years
The remaining 15 girls is 10 years
Formula Used:
Average = 
sum of AgesTotal number of girls
Calculations:
The average age of 25 girls in a class is 11.2 years
⇒ Sum of ages = Average x Total number of girls
= 11.2 x 25 = 280
Now, The remaining 15 girls are 10 years
⇒ Sum of ages = Average x Total number of girls
= 10 x 15 = 150
The total sum of ages of all 40 girls 
⇒ Sum of ages = 280 + 150 = 430
⇒ Average = 
sum of AgesTotal number of girls=43040
 = 10.75 years
⇒ 
Hence, The average age of all 40 girls is 10.75 years
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Most Upvoted Answer
The average age of 25 girls in a class is 11.2 years and that of the r...
Calculation of Average Age of All Girls in the Class

Given Data:
- Number of girls in the class = 25 (average age = 11.2 years)
- Number of remaining girls in the class = 15 (average age = 10 years)

Calculation:
- Total age of 25 girls = 25 * 11.2 = 280 years
- Total age of 15 girls = 15 * 10 = 150 years
- Total age of all girls = 280 + 150 = 430 years

Formula for Average Age:
Average Age = Total Age / Total Number of Girls

Substitute Values:
Average Age = 430 / 40 (25 girls + 15 girls) = 10.75 years
Therefore, the average age of all the girls in the class is 10.75 years, which corresponds to option 'A'.
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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.a)10.75 yearsb)11.35yearsc)10.45yearsd)11.05yearsCorrect answer is option 'A'. Can you explain this answer?
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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.a)10.75 yearsb)11.35yearsc)10.45yearsd)11.05yearsCorrect answer is option 'A'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about 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.a)10.75 yearsb)11.35yearsc)10.45yearsd)11.05yearsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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.a)10.75 yearsb)11.35yearsc)10.45yearsd)11.05yearsCorrect answer is option 'A'. Can you explain this answer?.
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