If there are 22 boys and 18 girls in a class, what is the percentage of boys in the class?
某班有22名男生，18名女生，则男生人数占全班人数的多少．
<gadget id="calculator">22 + 18</gadget>
<output>40</output>

<gadget id="calculator">22 / 40</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>