54-□/6*3=36, what is the number represented by □.
54-□/6*3=36，□代表的数是多少．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>