Janet paid with $20 and got back $11, so her muffins cost $20 - $11 = $<<20-11=9>>9.

Each muffin cost 75 cents, so she bought 9/.75 = <<9/.75=12>>12 muffins

# Answer

12
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Janet bought some muffins at the bakery. Each muffin is 75 cents. Janet paid $20 and got $11 in change back. How many muffins did Janet buy?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
Janet bought some muffins at the bakery. Each muffin is 75 cents. Janet paid $20 and got $11 in change back. How many muffins did Janet buy?
train