For a colored ribbon, the ratio of used to remaining is 5:6, how much of this colored ribbon has been used
一条彩带，已用的和剩下的比是5：6，已经用的是这条彩带的多少
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<result>5/11 = around 0.454545</result>