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?
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 = $$26\times11$$
=Â 286
The average age of all these boys and girls taken together =Â $$\frac{144+286}{9+11}$$
= $$\frac{430}{20}$$
= 21.5Â years
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