In a class, the average age of 30 boys is 13 years and the average of 20 girls is 12 years. what is the average age of the whole class?  Select:
A) 12.9  B) 12.1  C) 12.3`  D) 12.6  E) 12.5
Total age of 50 students   (30X 13+20 X 12) = 630   Average = 630/50= 
<gadget id="calculator">630/50</gadget>
<output>63/5 = around 12.6</output>
12.6 Years   Answer: 12.6
<result>D</result>
In a class, the average age of 30 boys is 13 years and the average of 20 girls is 12 years. what is the average age of the whole class?