The former term of a ratio is 2, the ratio is (1/5), and what is the latter term.
一个比的前项是2，比值是(1/5)，后项是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / (1/5)</gadget>
<output>10</output>

<result>10</result>