If the average (arithmetic mean) of 2, 7, and x is 12, what is the value of x?
1 answer:
The three numbers are 2, 7 and x.
Ther sum is
2 + 7 + x = 9 + x
Because the arithmetic mean is 12, therefore
(9 + x)/3 = 12
9 + x = 12*3 = 36
x = 36 - 9 = 27
Answer: x = 27
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