Assuming the special right triangle properties are right lol
If 100 cats killed 100 mice in 100 days, you can say that each cat killed one mouse the day after the last cat. So, if four cats killed four mice, and we're going of off the same basis that each cat killed one mouse the day after the last cat, then the answer would be 4.
Take a look at the attachment, but the correct answer is
12 feet.
Outcomes in a sample space :)