Urgent!

Just divide (2+ 1/2) by (1/8)      ....    so we get

5/2 / 1/8       And inverting the second fracction and multiplying, we have

5/2 * 8/1 = 40 / 2    = 20 glasses

2.5 / 0.125 = 20 glasses

Why was the question Urgent?

Did you need to know how to divide the vodka to make screwdrivers?

Easy, Anonymous.....Let's not turn Water into Whine.......

$$\\\left( \frac { 1\;glass\ } { \frac{1}{8}\;\textcolor[rgb]{1,0,0}{\not}l } \right)* \left( \frac{2.5\; \textcolor[rgb]{1,0,0}{\not}{l} } {1\;bottle} \right)=2.5*8\;\frac{glass}{bottle}=20\;\frac{glass}{bottle}\\\\ \Rightarrow 20\;\mbox{glass per one bottle}$$

\\\left(
\frac
{
1\;glass\
}
{
\frac{1}{8}\;\textcolor[rgb]{1,0,0}{\not}l
}
\right)*
\left( \frac{2.5\;
\textcolor[rgb]{1,0,0}{\not}{l}
}
{1\;bottle} \right)=2.5*8\;\frac{glass}{bottle}=20\;\frac{glass}{bottle}\\\\
\Rightarrow  20\;\mbox{glass per one bottle}