The numerator of (4/11) is increased by 4, how much should the denominator be increased to keep the size of the fraction constant
(4/11)的分子增加4，要使分数的大小不变，分母应该增加多少
<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

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

<result>11</result>