For the Proportion, Find the Unknown Number N $\frac { 3 } { \frac { 1 } { 6 } } = \frac { 18 } { n }$

For the proportion, find the unknown number n.
- $\frac { 3 } { \frac { 1 } { 6 } } = \frac { 18 } { n }$

A) 36
B) 1
C) 3
D) $\frac { 1 } { 3 }$