The lower base of a trapezoid is three times the upper base, and the upper base is extended by 8 cm to form a parallelogram with an area of 192 cm2. What is the area of this trapezoid in square centimetres.
一个梯形的下底是上底的3倍，把上底延长8厘米，恰好组成一个面积是192平方厘米的平行四边形．这个梯形的面积是多少平方厘米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">4 + 12</gadget>
<output>16</output>

<gadget id="calculator">192 / 12</gadget>
<output>16</output>

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

<gadget id="calculator">16 * 8</gadget>
<output>128</output>

<result>128</result>