The numerator of (5/9) is increased by 10, how much should the denominator be multiplied to keep the size of the fraction constant?
(5/9)的分子增加10，要使分数的大小不变，分母应乘以多少
<gadget id="calculator">5 + 10</gadget>
<output>15</output>

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

<result>3</result>