Xiao Zhang and Xiao Wang live in the same building, and the number of stairs between two adjacent floors of this building is the same. Xiao Zhang lives on the 4th floor, and he has to take 54 stairs to go home, and Xiao Wang has to take 126 stairs to go home. How many floors does Xiao Wang live in?
小张和小王住在同一幢楼里，这幢楼相邻两层间的楼梯级数相同．小张住4楼，回家要走54级楼梯，小王回家要走126级楼梯．小王住在多少楼．
<gadget id="calculator">54 / 3</gadget>
<output>18</output>

<gadget id="calculator">126 / 18</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>