There are 30 boys and 40 girls in a class If the average age of boys is 10 yr and average age of gir...........

Quantitative Aptitiude (CLAT) Average

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 yrs

8.86 yrs

8.2 yrs

9 yrs

Explanation:

Boys = 30, Girls = 40
Average age of boys is x/30 = 10
x = 300
Average age of Girls is y/40 = 8
y = 320
Average age of whole class = x + y/70
= 300 + 320 /70 = 8.86 yrs
Hence, option 2 is the correct answer.