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?	Choose one.
A) 12 Years
B) 12.3 Years
C) 12.6 Years
D) 16.7 Years
E) 15 Years
Total age of 70 students   (40X 18+30 X 15) = 1170   Average = 1170/70 = 16.7 Years   16.7 Years
<result>D</result>
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?