If the number of boys is 70% of the number of girls, then the number of girls is the number of boys
男生人数是女生人数的70%，那么女生人数是男生的多少
<gadget id="calculator">70 / 100</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>