SOLUTION: What is the method to solve this question?? The average of four numbers is 7. If the average of first three numbers is 8 then find the fourth number?

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Question 604249: What is the method to solve this question??
The average of four numbers is 7. If the average of first three numbers is 8 then find the fourth number?
Answer by flame8855(424) About Me  (Show Source):
You can put this solution on YOUR website!
the sum of the 4 numbers = 4*7 =28
the sum of the 3 numbers = 3*8= 24
the fourth number = 28-24 =4