There are 30 boys in Class 1, which is 25% less than girls. What is the correct formula for finding the number of girls?
六一班有男生30人，比女生少25%，求女生人数正确的列式是多少
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 / (3/4)</gadget>
<output>40</output>

<result>40</result>