Let x, y, and z be non-zero numbers such that the average (arithmetic mean) of x and

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Let x, y, and z be non-zero numbers such that the average (arithmetic mean) of x and twice y is equal to the average (arithmetic mean) of y and twice z. What is the average (arithmetic mean) of x and y?

a. z/2

b. z

c. 2z

d. z − x

e. z − y

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