If the boys in class 1 account for the whole class (11/21), how many girls account for the boys
六1班男生占全班人数的(11/21)，则女生占男生的多少
<gadget id="calculator">11 / 21</gadget>
<output>11/21 = around 0.52381</output>

<gadget id="calculator">1 - (11/21)</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">(10/21) / (11/21)</gadget>
<output>10/11 = around 0.909091</output>

<result>10/11 = around 0.909091</result>