A passenger ship sails from A to B. When it arrives at C on the way, (2/7) passengers disembark, and 54 people board again. At this time, the passengers on board are the original (13/14), How many passengers were on board?
一艘客轮从甲地开往乙地，途中到达丙地时，有(2/7)的旅客离船上岸，又有54人上船，这时船上的旅客是原来的(13/14)，原来船上有多少旅客？
<gadget id="calculator">13 / 14</gadget>
<output>13/14 = around 0.928571</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(13/14) - (5/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">54 / (3/14)</gadget>
<output>252</output>

<result>252</result>