FERMAT 2003 Problem 9

Past Contests FERMAT FERMAT - 2003
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1

The average (mean) of \frac15 and \frac{1}{10} is \frac1x. The value of x is

Answer Choices
A. \frac{20}{3}
B. \frac{3}{20}
C. 30
D. \frac{10}{3}
E. \frac{2}{15}