If the average weights of three groups of 15,20,25 children respectively is 20,25,30 what is the average weights of all the children? Choose the correct choice from the following choices:  A) 32.89  B) 12.89  C) 38.76  D) 25.83  E) 43.74
Average weights of group 1 =20   children in group 1 = 15   Total weights of group 1 = 15*20   Average weights of group 2 = 25   children in group 2 = 20   Total weights of group 2 = 25*20   Average weights of group 3 = 30   children in group 3 = 25   Total weights of group 3 = 25*30   Total children = 15+20+ 25= 
<gadget id="calculator">15+20+ 25</gadget>
<output>60</output>
60   Average weights of all the children=((15*20)+(25×20)+(25×30))/60   =155/6   =25.83   Answer is 25.83.
<result>D</result>
If the average weights of three groups of 15,20,25 children respectively is 20,25,30 what is the average weights of all the children?