(13/50) at (1/1), (1/2), (2/2), (1/3), (2/3), (3/3), (1/4), (2 /4), (3/4), (4/4)… What is the number in the ranking?
(13/50)在(1/1)，(1/2)，(2/2)，(1/3)，(2/3)，(3/3)，(1/4)，(2/4)，(3/4)，(4/4)…中排第多少位．
<gadget id="calculator">1 + 49</gadget>
<output>50</output>

<gadget id="calculator">49 / 2</gadget>
<output>49/2 = around 24.5</output>

<gadget id="calculator">50 * (49/2)</gadget>
<output>1_225</output>

<gadget id="calculator">1_225 + 13</gadget>
<output>1_238</output>

<result>1_238</result>