For a rectangular campus, its length and width are 15 cm and 12 cm respectively on a drawing with a scale of 1:3000. How many square meters does this campus occupy?
一个长方形的校园，它的长与宽在比例尺是1：3000的图纸上的长度分别是15厘米和12厘米，这个校园的占地面积是多少平方米？
<gadget id="calculator">1 / 3_000</gadget>
<output>1/3_000 = around 0.000333</output>

<gadget id="calculator">15 / (1/3_000) / 100</gadget>
<output>450</output>

<gadget id="calculator">12 / (1/3_000) / 100</gadget>
<output>360</output>

<gadget id="calculator">450 * 360</gadget>
<output>162_000</output>

<result>162_000</result>