Question

Class x, the average age of 35 boys is 14 years and the average of 25 girls is 12 years. what is the average age of the entire class?

Answer 1

Find total age of the boys:

Average age of 35 boys = 14 years old (Given)

Sum of the age of the 35 boys = 14 x 35 = 490 years old

.

Find total age of the girls:

Average age of 25 girls = 12 years old (Given)

Sum of the age of the 25 girls = 12 x 25 = 300 years old.

.

Find average age of the entire class:

Total number of students = 35 + 25 = 60

Sum of all their age = 490 + 300 = 790

Average age of the entire class = 790 ÷ 60 = 13.17 years old

.

Average age of the entire class is 13.17 years old