Average age of 5 boys is 15 years. Average age of 10 girls is 12 years. What is the combined average age (in years) of these boys and girls?
Show answer & explanation
Correct answer: C
Explanation
Given:
Average of 5 boys = 15 years
Average of 10 girls = 12 years
According to the formula:
Combined Average = (Total Sum) / Total Number
Sum for boys = 5 × 15 = 75
Sum for girls = 10 × 12 = 120
Total Sum = 75 + 120 = 195
Total Number = 5 + 10 = 15
Average = 195 / 15 = 13