The lower base of a trapezoid is 28 decimeters, which is 2 decimeters more than twice the upper base and twice the height. What is its area?
一个梯形的下底是28分米，比上底的2倍多2分米，又是高的2倍，它的面积是多少．
<gadget id="calculator">28 - 2</gadget>
<output>26</output>

<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 + 28</gadget>
<output>41</output>

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">41 * 7</gadget>
<output>287</output>

<result>287</result>