Xiao Ming lives on the 15th floor of an 18-story building. The whole building is 54 meters high. How many meters is the floor of Xiao Ming's house from the ground?
小明的家住一幢18层的楼房的第15层，整幢楼房高54米，小明家的地板到地面有多少米？
<gadget id="calculator">54 / 18</gadget>
<output>3</output>

<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">3 * 14</gadget>
<output>42</output>

<result>42</result>