Question

the average age of 12 boys of a class is 18.5 years and 13 girls of same class is 28.5 years. find average age of whole class. answer- 23.7​

Answer 1

Step-by-step explanation:

Let the sum of age of boys be x and the sum of age of girls be y.

Now,

average age of 12 boys and 13 girls is 18.5 and 28.5 respectively.

Therefore,

x/12=18.5

y/13=28.5

x=12×18.5=222

y=13×28.5=370.5

The average age of whole class is given by

sum of age of every student/number of students

Therefore,

Average age of whole class is: (x+y)/(12+13)

=(222+370.5)/25

=592.5/25

=23.7

Hence,the average age of whole class is 23.7