There are 50 * 30/100 = <<50*30/100=15>>15 boys at that party.

That means there are 50 - 15 = <<50-15=35>>35 girls.

# Answer

35
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
At a party, there are 50 people. 30% of them are boys. How many girls are at this party?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
35
At a party, there are 50 people. 30% of them are boys. How many girls are at this party?
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