There is a trapezoidal vegetable field, the upper base is 4.5 meters long, the lower base is 7.5 meters long, and the height is 10 meters. On average, 6 cabbages can be harvested per square meter. How many cabbages can be harvested in this field?
有一块梯形的菜地，上底长4.5米，下底长7.5米，高10米，平均每平方米能收6棵白菜，这块地共可以收多少棵白菜？
<gadget id="calculator">4.5 + 7.5</gadget>
<output>12</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">12 * 5 * 6</gadget>
<output>360</output>

<result>360</result>