He got 2*12=<<2*12=24>>24 cookies

So he has 24-3=<<24-3=21>>21 cookies left

# Answer

21
Question:
John buys 2 dozen cookies.  He eats 3.  How many cookies does he have left?
Answer:
Let's think step by step.

user
21
John buys 2 dozen cookies.  He eats 3.  How many cookies does he have left?
train