The numerator of (2/5) is increased by 10, how much should the denominator be increased to keep the size of the fraction constant
(2/5)的分子增加10，要使分数的大小不变，分母应增加多少
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<result>25</result>