Teacher Li walked a total of 18 steps from the first floor to the third floor of the teaching building. If the steps on each floor are the same, how many steps does he have to walk to get to the sixth floor?
李老师从教学楼一楼走到三楼一共走过18个台阶．如果每层楼的台阶相同，那么他要走到六楼，还要走过多少个台阶．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

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

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>