The ratio of a ratio is (1/3), if the latter term is 12, what is the former term.
一个比的比值是(1/3)，如果后项是12，则前项是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 * (1/3)</gadget>
<output>4</output>

<result>4</result>