Emily is making a punch that contains 75% apple juice and the rest ginger ale. the punch has 2 liters of ginger ale.

part a: write an equation using one variable that can be used to find the total number of liters of apple juice and ginger ale in the punch. define the variable used in the equation. (5 points)

part b: how many liters of apple juice are present in the punch? show your work. (5 points)

i don't understand this problem and i'm usually really good at math..