What is the measure of angle 1

Every time you drive you will experience a combination of driving conditions and environments.

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?

3.4a=57.8 what is the the value of a