Solution ratio: (3/7)=(6/(x)), then x=how much.
解比例：(3/7)=(6/(x))，则x=多少．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">6 / (3/7)</gadget>
<output>14</output>

<result>14</result>