Add 80 to the numerator of (8/13), how much should be added to the denominator to keep the size of this fraction constant
(8/13)的分子加上80，要使这个分数的大小不变，分母应该加上多少
<gadget id="calculator">13 * 11</gadget>
<output>143</output>

<gadget id="calculator">143 - 13</gadget>
<output>130</output>

<result>130</result>