In the first four houses, there are a total of 4 houses * 3 gnomes = <<4*3=12>>12 gnomes.

Therefore, the fifth house had 20 total gnomes – 12 gnomes = <<20-12=8>>8 gnomes.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There are 5 houses on a street, and each of the first four houses has 3 gnomes in the garden. If there are a total of 20 gnomes on the street, how many gnomes does the fifth house have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8
There are 5 houses on a street, and each of the first four houses has 3 gnomes in the garden. If there are a total of 20 gnomes on the street, how many gnomes does the fifth house have?
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