Give the step-by-step reasoning process and then the final answer. Mary is trying to count the animals in the petting zoo, but they kept moving around so she double-counts 7 sheep and forgets to count 3 pigs. If Mary thinks there are 60 animals, how many are there really?
First subtract the 7 double - counted animals from Mary's total: 60 animals - 7 animals = 53 animals. Then add the animals she missed to find the real total: 53 animals + 3 pigs = 56 animals.
The final answer: 56.