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The average age of a class of 6 girls is x years. Four new girls having ages x - 2, x + 2, x + 4 and x + 6 join the class. What is the new average age (in years) of the class?
Answer & Solution
Correct Answer:
Option
A
Total age of a class of 6 girls = 6x
Four new girls ages = 4x + 10
Average age of 10 girls
$$\eqalign{ & = \frac{{10x + 10}}{{10}} \cr & = x + 1 \cr} $$
Four new girls ages = 4x + 10
Average age of 10 girls
$$\eqalign{ & = \frac{{10x + 10}}{{10}} \cr & = x + 1 \cr} $$
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