# 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

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

• 8 year

• 8.86 year

• 8.2 year

• 9 year

#### 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
Is there an error in this question or solution?