Multiple choice

The average age of 15 boys in a class is 19 years and average age of 20 girls is 17 years. Then find out the combined average age of all the students of the class.

  1. 17.36 Years

  2. 18 Years

  3. 17.86 Years

  4. 17.50 Years

  5. 19 Years
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C Correct answer
Explanation

The combined average is calculated by finding the total sum of ages and dividing by the total number of students. Total sum = (15 * 19) + (20 * 17) = 285 + 340 = 625. Combined average = 625 / 35 = 17.857, which rounds to 17.86.

AI explanation

The total age of the 15 boys is 15 times 19, which equals 285 years. The total age of the 20 girls is 20 times 17, which equals 340 years. The combined total age for all 35 students is 285 plus 340, yielding 625 years. Divide the total age of 625 by 35 students to calculate the combined average age of 17.86 years.

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