In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class is 13 years. What is the average age of the whole class?
(Rounded off to two digits after decimal)
  • a)
    13.50
  • b)
    13.53
  • c)
    12.51
  • d)
    13.42
  • e)
    None of these
Correct answer is option 'B'. Can you explain this answer?

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Answers

Pioneer Academy
Jan 22, 2022
Sum of all boys’ age = 32× 14 = 448
Sum of all girls’ age = 28 × 13 = 364 years
Sum of all the students’ age = 448 + 364 = 812 years
Average = 812/28+32 = 13.53 years

Sum of all boys’ age = 32× 14 = 448Sum of all girls’ age = 28 × 13 = 364 yearsSum of all the students’ age = 448 + 364 = 812 yearsAverage = 812/28+32 = 13.53 years
Sum of all boys’ age = 32× 14 = 448Sum of all girls’ age = 28 × 13 = 364 yearsSum of all the students’ age = 448 + 364 = 812 yearsAverage = 812/28+32 = 13.53 years