If the number of boys in a class of sixth grade accounts for 5/9 of the whole class, then how many girls account for the number of boys?
六年级某班男生人数占全班人数(5/9)，那么女生占男生人数的多少．
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>