A triangular vegetable field is 18 meters high and twice the base. On average, 12 Chinese cabbages are planted per square meter. How many Chinese cabbages are planted in this vegetable field?
一块三角形菜地，高是18米，是底的2倍．平均每平方米种大白菜12棵，这块菜地共种了多少棵大白菜？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<gadget id="calculator">12 * 81</gadget>
<output>972</output>

<result>972</result>