There are 26 boys in a class, accounting for 13/21 of the whole class, how many girls are there?
某班有男生26人，占全班人数的(13/21)，女生有多少人？
<gadget id="calculator">13 / 21</gadget>
<output>13/21 = around 0.619048</output>

<gadget id="calculator">26 / (13/21)</gadget>
<output>42</output>

<gadget id="calculator">1 - (13/21)</gadget>
<output>8/21 = around 0.380952</output>

<gadget id="calculator">42 * (8/21)</gadget>
<output>16</output>

<result>16</result>