If the average costs of three colors of 20,40,60 chocolates respectively is 10,15,20 what is the average costs of all the chocolates? Choose the correct answer
A) 12.22	B) 13.33	C) 14.44	D) 15.55	E) 16.66
Average costs of group 1 =10   chocolates in group 1 = 20   Total costs of group 1 = 10*20   Average costs of group 2 = 15   chocolates in group 2 = 40   Total costs of group 2 = 15*40   Average costs of group 3 = 20   chocolates in group 3 = 60   Total costs of group 3 = 20*60   Total chocolates = 20+40+60= 
<gadget id="calculator">20+40+60</gadget>
<output>120</output>
120   Average costs of all the chocolates=((10*20)+(15×40)+(20*60))/120   =50/3   =16.66   Answer is 16.66.
<result>E</result>
If the average costs of three colors of 20,40,60 chocolates respectively is 10,15,20 what is the average costs of all the chocolates?