Wang Wei went up from the first floor to the fifth floor, a total of 72 steps, how many steps are there on each floor?
王伟从一楼上到五楼，共上了72个台阶，每层有多少台阶．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>