1.

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

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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