The length of the living room measured on the home decoration floor plan with a scale of (1/250) is 3 cm. What is the actual length of the living room in meters?
在比例尺是(1/250)的家居装饰平面图上量得客厅的长是3厘米，实际客厅的长是多少米．
<gadget id="calculator">1 / 250</gadget>
<output>1/250 = around 0.004</output>

<gadget id="calculator">3 / (1/250)</gadget>
<output>750</output>

<gadget id="calculator">750 / 100</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>