If the average ages of three groups of 30, 40, 50 people respectively is 30,40,50 what is the average ages of all the people?  Choose the correct choice from the following
A) 23.78 B) 41.66 C) 34.67 D) 23.9 E) 43.98
Average ages of group 1 =30   people in group 1 = 30   Total ages of group 1 = 30*30   Average ages of group 2 = 40   people in group 2 = 40   Total ages of group 2 = 40*40   Average ages of group 3 = 50   people in group 3 = 50   Total ages of group 3 = 50*50   Total people = 40 + 30 + 50= 
<gadget id="calculator">40 + 30 + 50</gadget>
<output>120</output>
120   Average ages of all the people=((40*40)+(50×50)+(30×30))/120   =125/3   =41.66   Answer is 41.66.
<result>B</result>
If the average ages of three groups of 30, 40, 50 people respectively is 30,40,50 what is the average ages of all the people?