In a class, the average age of 40 boys is 18 years and the average of 30 girls is 15 years. what is ...

In a class, the average age of 40 boys is 18 years and the average of 30 girls is 15 years. what is the average age of the whole class?

Quiz

Answer/Solution

16.7 Years

Steps/Work

Total age of 70 students
(40X 18+30 X 15) = 1170
Average = 1170/70 = 16.7 Years
D