There is a number that is multiplied by 4, added to 6, divided by 3 to get 18, what is this number?
有一个数乘4，加上6，除以3，得18，这个数是多少．
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 - 6</gadget>
<output>48</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>