A simple fraction (1/9)<((a)/(b))<(1/8), when the denominator is the smallest, a+b=how much.
一个最简分数(1/9)＜((a)/(b))＜(1/8)，当分母最小时，a+b=多少．
<gadget id="calculator">2 + 17</gadget>
<output>19</output>

<result>19</result>