The lower base of a trapezoid is three times the upper base. If the upper base is extended by 8 cm, a parallelogram is obtained, and the area is increased by 24 cm2. What is the area of the trapezoid in cm2?
一个梯形下底是上底的3倍，如果把上底延长8厘米，就得到一个平行四边形，且面积增加24平方厘米，这个梯形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">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">24 * (1/4)</gadget>
<output>6</output>

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

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

<result>48</result>