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In a class the average age of 20 boys is 14 years and the average age of 30 girls is 12 years. The average age of the whole class (approx) is
  • a)
    12.8                         
  • b)
    12.4
  • c)
    12.2                         
  • d)
    12.6
  • e)
    None of these
Correct answer is option 'A'. Can you explain this answer?
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In a class the average age of 20 boys is 14 years and the average age ...
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In a class the average age of 20 boys is 14 years and the average age ...
Given:
Average age of 20 boys = 14 years
Average age of 30 girls = 12 years

To find:
Average age of the whole class

Solution:
Let the total age of 20 boys be X.
Then, the total age of 30 girls will be (20*14) = 280 - X (since the sum of ages of both boys and girls will be equal to the total age)

Now, the total age of the whole class = X + (280 - X) = 280

The number of students in the class = 20 + 30 = 50

Therefore, the average age of the whole class = (Total age of the whole class) / (Number of students in the class) = 280 / 50 = 5.6 years

Rounding off to one decimal place, the average age of the whole class is approximately 12.8 years.

Hence, the correct option is (a) 12.8.
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In a class the average age of 20 boys is 14 years and the average age of 30 girls is 12 years. The average age of the whole class (approx) isa)12.8b)12.4c)12.2d)12.6e)None of theseCorrect answer is option 'A'. Can you explain this answer?
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In a class the average age of 20 boys is 14 years and the average age of 30 girls is 12 years. The average age of the whole class (approx) isa)12.8b)12.4c)12.2d)12.6e)None of theseCorrect answer is option 'A'. Can you explain this answer? for Quant 2024 is part of Quant preparation. The Question and answers have been prepared according to the Quant exam syllabus. Information about In a class the average age of 20 boys is 14 years and the average age of 30 girls is 12 years. The average age of the whole class (approx) isa)12.8b)12.4c)12.2d)12.6e)None of theseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Quant 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a class the average age of 20 boys is 14 years and the average age of 30 girls is 12 years. The average age of the whole class (approx) isa)12.8b)12.4c)12.2d)12.6e)None of theseCorrect answer is option 'A'. Can you explain this answer?.
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