The lower base of a trapezoid is 20 cm, and the upper base is extended by 6 cm to form a parallelogram. At this time, the area is increased by 30 cm2. What is the area of the original trapezoid in cm2?
一个梯形的下底为20厘米，上底延长6厘米，成为一个平行四边形，这时面积增加了30平方厘米，原梯形的面积是多少平方厘米？
<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<gadget id="calculator">20 + 14</gadget>
<output>34</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

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

<gadget id="calculator">34 * 5</gadget>
<output>170</output>

<result>170</result>