Add 6 to the numerator of (3/8), how much should be added to the denominator to keep the size of the fraction constant
(3/8)的分子加上6，要使分数的大小不变，分母应加上多少
<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<result>16</result>