In a class, the number of boys is 6/7 of the number of girls, how much more girls than boys
一个班中，男生人数是女生人数的6/7，女生人数比男生人数多多少
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 - (6/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) / (6/7)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>