Add 9 to the numerator of (6/8), how much to add to the denominator will the size of the fraction not change.
(6/8)的分子加上9，分母加多少分数的大小才不会变．
<gadget id="calculator">9 / 6</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">8 * (3/2)</gadget>
<output>12</output>

<result>12</result>