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? Options
A) 12 Years  B) 12.6 Years  C) 13.6 Years  D) 14 Years  E) 14.5 Years
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 \   12.6 Years
<result>B</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?