Question 67

The average age of 9 girls is 16 years. The average age of 11 boys is 26 years. What is the average age of all these boys and girls taken together?

Solution

The average age of 9 girls is 16 years.

total age of 9 girls = $$16\times9$$ = 144

The average age of 11 boys is 26 years.

total age of 11 boys = $$26\times11$$

= 286

The average age of all these boys and girls taken together = $$\frac{144+286}{9+11}$$

= $$\frac{430}{20}$$

= 21.5 years

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