Zhang, Wang, and Li have a total of 54 yuan. Zhang used his own money (3/5), Wang used his own money (3/4), and Li used his own money (2/3). If they bought a pen with the same price, how much money did Zhang and Li have left?
张、王、李共有54元，张用了自己钱数的(3/5)，王用了自己钱数的(3/4)，李用了自己钱数的(2/3)，各买了一只价格相同的钢笔，那么张和李两人剩下的钱共有多少_元．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) / (3/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) / (2/3)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">1 + (5/4) + (9/8)</gadget>
<output>27/8 = around 3.375</output>

<gadget id="calculator">54 / (27/8)</gadget>
<output>16</output>

<gadget id="calculator">16 * (5/4)</gadget>
<output>20</output>

<gadget id="calculator">16 * (9/8)</gadget>
<output>18</output>

<gadget id="calculator">16 * (5/4) * (3/5)</gadget>
<output>12</output>

<gadget id="calculator">16 * (9/8) * (2/3)</gadget>
<output>12</output>

<gadget id="calculator">18 - 12 - 12</gadget>
<output>-6</output>

<gadget id="calculator">20 + (-6)</gadget>
<output>14</output>

<result>14</result>