Add 8 to the numerator of (2/9), what should be the denominator so that the size of the fraction will not change.
把(2/9)的分子加8，分母应为多少，分数的大小才会不变．
<gadget id="calculator">2 + 8</gadget>
<output>10</output>

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

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>