cuboid reservoir is 20 meters long, 2 meters wide, and 3 meters deep. How many square meters does it cover?
一个长方体蓄水池长20米，宽2米，深3米，它的占地面积是多少平方米？
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<result>40</result>