A, B, and C have a total of 54 yuan. A uses his own money (1/2), B uses his own money (1/3), and C uses his own money (1/4). With the same pen, ask: How much money do the three of you have left?
甲乙丙三人共有54元，甲用了自己钱数的(1/2)，乙用了自己钱数的(1/3)，丙用了自己钱数的(1/4)，各买了一只同样的钢笔，问：三人剩下的钱共有多少元？
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">54 / 9</gadget>
<output>6</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">54 - 18</gadget>
<output>36</output>

<result>36</result>