Is 4 out of 8 and one out of two equivalent

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Someone me i need with this stuff