In a building with a height of 91 meters, the height of the first floor is 4.6 meters, and the height of each other floor is 3.2 meters. How many floors does this building have?
一幢高91米的楼房，一楼的层高是4.6米，其余每层的层高都是3.2米．这幢楼一共有多少层？
<gadget id="calculator">91 - 4.6</gadget>
<output>86.4</output>

<gadget id="calculator">86.4 / 3.2</gadget>
<output>27</output>

<gadget id="calculator">27 + 1</gadget>
<output>28</output>

<result>28</result>