Subtract 8 from the numerator of (12/24), what should be the denominator to keep the size of the fraction constant.
把(12/24)的分子减去8，要使分数的大小不变，分母应该多少．
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

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

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

<result>16</result>