First subtract the 7 double-counted animals from Mary's total: 60 animals - 7 animals = <<60-7=53>>53 animals

Then add the animals she missed to find the real total: 53 animals + 3 pigs = <<53+3=56>>56 animals

# Answer

56
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
56
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?
train