A trapezoidal lawn has an upper base of 12 meters, a lower base of 8 meters, and a height of 20 meters. If one flower is planted per 2 square meters, how many flowers can be planted in total?
一块梯形草坪上底12米，下底8米，高是20米，如果每2平方米栽1棵花，一共可以栽多少棵花？
<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>