For a trapezoid, the upper base is 20, the lower base is 32, the lower base is extended (1/4), the upper base and height remain unchanged, and the area increases by 76, find the area of the original trapezoid.
一个梯形，上底是20，下底是32，下底延长(1/4)，上底和高不变，面积增加76，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>