Answer:

Explanation:
Here x represents the number of student and y represents the amount of juice remain after x students are served,
Given,
The total number of cup = 32,
And, the amount of juice in 32 cups = 2 gallon,
⇒ The amount in 1 cup =
=
gallons,
Number of cups served to a student =
cup.
⇒ The amount of juice served to a student =
gallon.
⇒ The amount of juice served to x students =
gallon
Thus, the remaining amount of juice = The amount of juice in 32 cups - served amount
⇒

Which is the required equation.