The ratio of a ratio is (1/4), if the former term is 15, then what is the latter term.
一个比的比值是(1/4)，如果前项是15，则后项是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<result>60</result>