Add 4 to the numerator of (2/11), how much should be added to the denominator to keep the size of the fraction constant
(2/11)的分子加上4，要使分数的大小不变，分母应加上多少
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 * 11</gadget>
<output>33</output>

<gadget id="calculator">33 - 11</gadget>
<output>22</output>

<result>22</result>