Add 10 to the numerator of (5/9), how much should be added to the denominator to keep the size of the fraction constant
(5/9)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">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">27 - 9</gadget>
<output>18</output>

<result>18</result>