MathDB

6

Part of 1958 AMC 12/AHSME

Problems(1)

Arithmetic Mean

Source:

6/13/2009
The arithmetic mean between \frac {x \plus{} a}{x} and \frac {x \minus{} a}{x}, when x \not \equal{} 0, is: (A)\ {2}\text{, if }{a \not \equal{} 0}\qquad (B)\ 1\qquad (C)\ {1}\text{, only if }{a \equal{} 0}\qquad (D)\ \frac {a}{x}\qquad (E)\ x