SOLUTION: The average of 8 numbers is 15, four of these numbers are 21,5,6, and 12. what is the average of the other four numbers?

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Question 834480: The average of 8 numbers is 15, four of these numbers are 21,5,6, and 12. what is the average of the other four numbers?
Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
8*15 = 120
The sum of the numbers must be 120
21 + 5 + 6 + 12 = 44
120 - 44 = 76
76/4 = 19 average