Total age of 60 students
(45X 10+15 X 10) = 630
Average = 600/60 = 10 Years
In a class, the average age of 45 boys is 10 years and the average of 15 girls is 10 years. what is the average age of the whole class?
  12 Years
  12.3 Years
  10 Years
  13 Years
  15 Years