Respuesta :

gmany

[tex]1\ ft=12\ in\to3\ ft=3(12\ in)=36\ in\\\\3\ ft:18\ in=36\ in:18\ in=36:18=\dfrac{36}{18}=\dfrac{2}{1}=2:1\\\\Answer:\ \boxed{3\ ft:18\ in=2:1}[/tex]