SOLUTION: Could someone please help with this problem? The average of the first 7 numbers was 21. The average of the next 3 numbers was only 11. What was the overall average of the numbers?

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Question 604138: Could someone please help with this problem?
The average of the first 7 numbers was 21. The average of the next 3 numbers was only 11. What was the overall average of the numbers?
Answer by alicealc(293) About Me  (Show Source):
You can put this solution on YOUR website!
(7*21)+(3*11)/(7+3)
= (147+33)/10
= 180/10
= 18