Independent versus dependent variables

Problem

Your favorite anime series has episodes that are 20 minutes long. In the equation below, w is the number of episodes you watch and t is the number of minutes you spend watching anime.
The relationship between these two variables can be expressed by the following equation:
t, equals, 20, w
Identify the dependent and independent variables.
 
Dependent variable
Independent variable
The number of episodes you watch
The number of minutes you spend watching anime
Do 4 problems