Add 36 to the numerator of (4/7), how much should be added to the denominator to keep the size of the fraction unchanged.
(4/7)的分子加上36，要使分数的大小不变，分母应加上多少．
<gadget id="calculator">4 + 36</gadget>
<output>40</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">7 * 10</gadget>
<output>70</output>

<gadget id="calculator">70 - 7</gadget>
<output>63</output>

<result>63</result>