Multiply the numerator of (4/11) by 4, how much should be added to the denominator to keep the size of the fraction constant.
给(4/11)的分子乘4，要使分数的大小不变，分母应加上多少．
<gadget id="calculator">11 * 4</gadget>
<output>44</output>

<gadget id="calculator">44 - 11</gadget>
<output>33</output>

<result>33</result>