Why is the alamo important to us history?

Ineed with number 17 i don’t get it at alll

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?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes