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 180 cm2. What is the area of the original trapezoid in cm2?
一个梯形的下底是上底的3倍，把上底延长8厘米，组成一个面积是180平方厘米的平行四边形，原来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">180 / 12</gadget>
<output>15</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">16 * (15/2)</gadget>
<output>120</output>

<result>120</result>