A cabbage field is trapezoidal in shape, the upper base is 8 meters, the lower base is 12 meters, and the height is 18 meters. If an average cabbage covers an area of 9 square decimeters, how many cabbages are there in total?
一块白菜地的形状是梯形，上底是8米，下底是12米，高是18米．如果平均每棵白菜占地9平方分米，这块地里一共有白菜多少棵？
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">18 / 2 / 0.09</gadget>
<output>100</output>

<gadget id="calculator">20 * 100</gadget>
<output>2_000</output>

<result>2_000</result>