The number of boys is the number of girls (7/10), then the number of girls is the number of boys
男生人数是女生人数的(7/10)，那么女生人数是男生的多少
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 / (7/10)</gadget>
<output>10/7 = around 1.428571</output>

<result>10/7 = around 1.428571</result>