It is hoped that there are 50 boys and 20 girls in Class 2, Grade 6, how many percent are girls less than boys?
希望小学六年级2班有男生50人，女生20人，女生比男生少百分之几？
<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<gadget id="calculator">30 / 50</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>