<human>:  At a party, there are 50 people. 30% of them are boys. How many girls are at this party?
<bot>: How many boys are at that party? ** There are 50 * 30/100 = <<50*30/100=15>>15 boys at that party.
How many girls are at that party? ** That means there are 50 - 15 = <<50-15=35>>35 girls.
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