Add 8 to the numerator of (2/11), how much should the denominator be multiplied to keep the size of the fraction unchanged.
把(2/11)的分子加上8，要使分数的大小不变，分母应乘多少．
<gadget id="calculator">2 + 8</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>