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

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MCQ

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

Options

  • 8 year

  • 8.86 year

  • 8.2 year

  • 9 year

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Solution

8.86 year

Explanation:

Average of 30 boys and 40 girls

`=(30xx10+40xx8)/(30+40)=(300+320)/70`

= 8.86  yr approx

Concept: Average and Age
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