There are $30$ boys and $40$ girls in a class. If the average age of boys is $10$ yr and average age of girls is $8$ yr, then the average age of the whole class is

8 y e a r

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8.86 y e a r

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8.2 y e a r

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9 y e a r

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Solution

The correct option is C $8.86 y e a r$
Average of $30$ boys and $40$ girls
$= \frac{30 \times 10 + 40 \times 8}{30 + 40} = \frac{300 + 320}{70} = 8.86 y r$ approx.

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There are 30 boys and 40 girls in a class. If the average age of boys is 10 yr and average age of girls is 8 yr, then the average age of the whole class is

The correct option is C 8.86 yearAverage of 30 boys and 40 girls=30×10+40×830+40=300+32070=8.86 yr approx.

There are $30$ boys and $40$ girls in a class. If the average age of boys is $10$ yr and average age of girls is $8$ yr, then the average age of the whole class is

The correct option is C $8.86 y e a r$
Average of $30$ boys and $40$ girls
$= \frac{30 \times 10 + 40 \times 8}{30 + 40} = \frac{300 + 320}{70} = 8.86 y r$ approx.