How can you find the volume of this aquarium

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?

Anyone know? will mark brainliest if correct

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?