Noah is housing animals, each animal has a fixed cost to feed. He places each animal in either
pen A or pen B. Noah currently only collects dogs and cats.
You know that:
Each dog cost $4 to feed.
Pen A and B have 6 animals each.
Pen A has one more dog than Pen B, and costs $1 more to feed.
How much less does each cat cost to feed than each dog?
