Explain how to get the variable alone in the following equation a / 13=4

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?

Find the value of x. give reasons to justify your solutions! c ∈ ae

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?