SOLUTION: The average of 10 numbers is 6.the average of 5 numbers is 12. What is the mean of the combined 15 numbers

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Question 1144401: The average of 10 numbers is 6.the average of 5 numbers is 12. What is the mean of the combined 15 numbers
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!

          total      10(6)+5(12)
mean =  --------- = -------------
        how many        10+5