There are 21 girls in class 5 and 2, 6 fewer than boys. What percentage of the whole class are boys?
五2班有女生21人，比男生少6人，男生占全班人数的几分之几？
<gadget id="calculator">21 + 6</gadget>
<output>27</output>

<gadget id="calculator">21 + 6 + 21</gadget>
<output>48</output>

<gadget id="calculator">27 / 48</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>