E
Editor
Sep 18, 2022
What is the arithmetic mean of x and y if \frac{1}{x}=\frac{1}{z}-\frac{1}{y} and xy=z?
Difficulty: Easy
A:
1
B:
1/2
C:
\frac{x+y+z}{3}
D:
\frac{x+y}{2}
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ID: 63273db5ca83163ac3a0a135