The latter term of the ratio is 12, the ratio is (5/6), what is the former term.
比的后项是12，比值是(5/6)，前项是多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">12 * (5/6)</gadget>
<output>10</output>

<result>10</result>