A 31-story building is 97.8 meters high. The first floor is the hall, and the floor height is 4.8 meters. How many meters is the average height of each floor?
一幢三十一层的大楼高97.8米，一楼是大厅，层高4.8米，其余平均每层高多少米？
<gadget id="calculator">97.8 - 4.8</gadget>
<output>93</output>

<gadget id="calculator">31 - 1</gadget>
<output>30</output>

<gadget id="calculator">93 / 30</gadget>
<output>31/10 = around 3.1</output>

<result>31/10 = around 3.1</result>