Multiply the numerator of (5/6) by 3, how much should the denominator be increased to keep the size of the fraction constant
把(5/6)的分子乘3，要使这个分数的大小不变，分母应增加多少
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

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

<result>12</result>