Add 10 to the numerator of (5/6), how much should be added to the denominator to keep the size of the fraction unchanged.
(5/6)的分子加上10，要使分数的大小不变，分母应加上多少．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 - 6</gadget>
<output>12</output>

<result>12</result>