SOLUTION: The average of x, y, and z is 80. If two of the numbers are 74 and 78, then what is the other number

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Question 332256: The average of x, y, and z is 80. If two of the numbers are 74 and 78, then what is the other number
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: "The average of x, y, and z is 80 " means that %28x%2By%2Bz%29%2F3=80. We're given that "two of the numbers are 74 and 78", so let x=74 and y=78 and plug them in to get %2874%2B78%2Bz%29%2F3=80. Now solve for 'z' to find the missing number.