Mashaal Masha
The function $f$ is defined by $f(x)=\frac{1}{6x}$. What is the value of $f(x)$ when $x=3$?
Difficulty: Easy
A: 

$\frac{1}{3}$

B: 

$\frac{1}{6}$

C: 

$\frac{1}{9}$

D: 

$\frac{1}{18}$

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