well, from 80000 only 80% went to the polls, how many is that?
if we take 80000 to be the 100%, then how much is the 80%?
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
80000&100\\
x&80
\end{array}\implies \cfrac{80000}{x}=\cfrac{100}{80}\implies \cfrac{80000\cdot 80}{100}\implies 64000=x[/tex]
now, from those 64000 60% voted for X, that means that the remaining 40% voted for Y, how many is that 40%?
well, if we take 64000 to be 100%, how much is 40%?
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
64000&100\\ y&40
\end{array}\implies \cfrac{64000}{y}=\cfrac{100}{40}\implies \cfrac{64000\cdot 40}{100}=y[/tex]
