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Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?
- A12.7
- B14.6
- C19.3
- D8.5
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CCommunity
Average of 6 boys = Sum of age of 6 boys/6
⇒ 14 = sum of ages of 6 boys/6
⇒ Sum of age of 6 boys = 84
Now,
Average of 11 girls = sum of age of 11 girls/11
⇒ 12 = sum of age of 11 girls/11
⇒ Sum of age of 11 girls = 132
Now,
Sum of age of all girls and boys together = 84 + 132 = 216
∴ Average = 216/17 = 12.7
⇒ 14 = sum of ages of 6 boys/6
⇒ Sum of age of 6 boys = 84
Now,
Average of 11 girls = sum of age of 11 girls/11
⇒ 12 = sum of age of 11 girls/11
⇒ Sum of age of 11 girls = 132
Now,
Sum of age of all girls and boys together = 84 + 132 = 216
∴ Average = 216/17 = 12.7