The height of the building is 29.2 meters. The first floor is ready to open a store. The storey is 4 meters high. The upper 9 floors are residential buildings. How many meters is the height of each floor of the house?
大楼高29.2米，一楼准备开商店，层高4米，上面9层是住宅．住宅每层高多少米？
<gadget id="calculator">29.2 - 4</gadget>
<output>25.2</output>

<gadget id="calculator">25.2 / 9</gadget>
<output>2.8</output>

<result>2.8</result>