Answer:
84 days
Explanation:
If you can finish 1 class in 2 days then that can be expressed as:
1C = 2D
C = 2D
How many days would it take to finish 42 classes? Multiply both sides by 42:
42C = 2D * 42
42C = 84D
Therefore, it will take 84 days to finish 42 classes.