SOLUTION: The average of the first 3 numbers was 80. The average of the next 9 numbers was 40. What was the overall average of the numbers?

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Question 972175: The average of the first 3 numbers was 80. The average of the next 9 numbers was 40. What was the overall average of the numbers?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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The average of the first three numbers is 80, so the total sum of the numbers is (3 x 80) 240.
For the next 9 numbers, the sum would be (9 x 40) 360.
The sum of the 12 (9+3) numbers would be (240+360) 600.
The average of 12 numbers whose sum is 600 is (600/12) 50.
ANSWER: The overall average of the numbers is 50.