The simplest fraction ((a)/(b)) satisfies (1/5)<((a)/(b))<(1/4), and b does not exceed 19, then the maximum possible value of a+b is the same as What is the product of the smallest possible values.
最简单分数((a)/(b))满足(1/5)＜((a)/(b))＜(1/4)，且b不超过19，那么a+b的最大可能值与最小可能值之积为多少．
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">4 + 19</gadget>
<output>23</output>

<gadget id="calculator">2 + 9</gadget>
<output>11</output>

<gadget id="calculator">23 * 11</gadget>
<output>253</output>

<result>253</result>