For a trapezoid, if the upper base is extended by 10 decimeters, the area will increase by 80 square decimeters and become a parallelogram. If the upper base of the original trapezoid is 6 decimeters, what is the area of the original trapezoid in square decimeters?
一个梯形，如果上底延长10分米，面积就增加80平方分米，而且变成了一个平行四边形．如果原梯形的上底是6分米，那么原梯形的面积是多少平方分米？
<gadget id="calculator">6 + 10 + 6</gadget>
<output>22</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 * (1/5)</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">22 * 8</gadget>
<output>176</output>

<result>176</result>