What is the measure of the third angle in the yellow​ triangle?

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?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Rounded to the nearest tenth, what is the value of x