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?
Average age of 6 boys = 14 years
=> Total age of 6 boys = $$6\times14=84$$ years
Similarly, total age of 11 girls = $$11\times12=132$$ years
$$\therefore$$ Average age (in years) of all boys and girls = $$\frac{(84+132)}{(6+11)}$$
= $$\frac{216}{17}=12.7$$
=> Ans - (A)
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