Since 80% of the people were adults, this means 100% - 80% = 20 % were children.

20% of the people vaccinated were children.

The number of children is 20% of 650.

20% = 0.2, so 0.2 * 650 = <<0.2*650=130>>130 children were vaccinated.

# Answer

130
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A clinic administered the covid vaccine to 650 people. 80% of the people were adults. How many of the vaccinated people were children?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
130
A clinic administered the covid vaccine to 650 people. 80% of the people were adults. How many of the vaccinated people were children?
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