There are 20 boys in Class 1 of the sixth grade, 25% more than girls. How many more boys than girls?
六年级1班有男生20人，比女生人数多25%，男生比女生多多少人？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">20 / (5/4)</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<result>4</result>