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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?1). 12.72). 14.63). 19.34). 8.5 |
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Answer» 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 |
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