Final answer:
The initial number of zombies in this scenario is 30.
Step-by-step explanation:
The initial number of zombies can be found by subtracting the number of zombies eaten by crows, vultures, wolves, and bears each day from the starting number of zombies. In this case, 3 zombies are eaten each day, so after 1 day, there will be 27 zombies left (30 - 3). Therefore, the initial number of zombies (intercept) in this scenario is 30.