The numerator of (5/12) is increased by 10, how much should the denominator of this fraction be increased to keep the size of this fraction constant.
(5/12)的分子增加10，要使这个分数的大小不变，这个分数的分母应当增加多少．
<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">36 - 12</gadget>
<output>24</output>

<result>24</result>