Solution ratio. 0.5:5=x:12.
解比列．0.5：5=x：12．
<gadget id="calculator">0.5 * 12</gadget>
<output>6</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>