The number of girls in the classroom is 20 * 40% = <<20*40*.01=8>>8 girls

Before new boys join, the number of boys in the classroom is 20 - 8 = <<20-8=12>>12 boys

If 5 new boys join, the new number of boys is 12+5=17 boys and the new total is 20+5=25 total people

The new percentage of girls in the class is 8 girls / 25 total people = 32%

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A 20 person classroom is filled with 40% girls. If 5 new boys join the classroom, what is the new percentage of girls in the class?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
32
A 20 person classroom is filled with 40% girls. If 5 new boys join the classroom, what is the new percentage of girls in the class?
train