Explain why it is necessary to rename 4 1/4 if you subtract 3/4 from it! ! : )

I'm so close to finishing all these.

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?

For how answer my question this will be the last question can you answer in math subject