Similar triangles and in direct measurement

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 first step of an indirect proof of a number that is divisible by two

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out