A trapezoid has a lower base of 32 cm and an upper base of 20 cm. If the lower base is extended (1/4) and the upper base and height remain unchanged, then the area of the new trapezoid is 76 cm2 larger than the original trapezoid. Find the original trapezoid area.
一个梯形，下底为32厘米，上底是20厘米，如果下底延长(1/4)，上底和高都不变，那么新梯形的面积比原梯形大76平方厘米，求原来的梯形面积．
<gadget id="calculator">20 + 32</gadget>
<output>52</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">32 * (1/4)</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">76 * (1/4)</gadget>
<output>19</output>

<gadget id="calculator">19 / 2</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">52 * (19/2)</gadget>
<output>494</output>

<result>494</result>