Respuesta :
Let 'x' be the proportion of trick-or-treaters that were not dressed as Snow White.
Given that three out of every five trick-or-treaters were dressed as Snow White.
Consider that, in fractions, unit element 1 represents the complete population under observation.
Now, there are only two possibilities, either a trick-or-treater was dressed as Snow White, or a trick-or-treater was not dressed as Snow White. Since there is no other possibility, the sum of two fractions must represent the total number of trick-or-treaters that came to the house, that is, the total population under consideration.
It follows that,
[tex]x+\frac{3}{5}=1[/tex]Resolve the expression to obtain 'x' as follows,
[tex]\begin{gathered} x=1-\frac{3}{5} \\ x=\frac{2}{5} \end{gathered}[/tex]Thus, the required proportion is obtained as,
[tex]\frac{2}{5}[/tex]