Koizumi, Xiaomei, and Ouou have a total of 54 yuan. Koizumi used his own money (3/5), Xiaomei used his own money (3/4), Ouou used his own money (2/5) /3), each bought the same pen, so how much money do Koizumi and Ou Ou have left in total?
小泉、小美、欧欧三人共有54元，小泉用了自己钱数的(3/5)，小美用了自己钱数的(3/4)，欧欧用了自己钱数的(2/3)，各买了一支相同的钢笔，那么小泉和欧欧两人剩下的钱共有多少元．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/5) / (3/4)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(3/5) / (2/3)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 + (4/5) + (9/10)</gadget>
<output>27/10 = around 2.7</output>

<gadget id="calculator">54 / (27/10)</gadget>
<output>20</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 * (9/10) * (1/3)</gadget>
<output>6</output>

<gadget id="calculator">8 + 6</gadget>
<output>14</output>

<result>14</result>