If the average (arithmetic mean) of 2 7 and x is 12 what is the value of x
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(2 + 7 + x)/3 = 12
2 + 7 + x = 12 × 3
2 + 7 + x = 36
9 + x = 36
x = 36 - 9
x = 27
2 + 7 + x = 12 × 3
2 + 7 + x = 36
9 + x = 36
x = 36 - 9
x = 27
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