The lower base of a right-angled trapezoid is 3.5 times the upper base. If the upper base is extended by 11 meters and the lower base is extended by 1 meter, it becomes a square. Find the area of this rectangular trapezoid.
一个直角梯形的下底是上底的3.5倍，如果上底延长11米，下底延长1米，就变成了正方形．求这个直角梯形的面积．
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">3.5 - 1</gadget>
<output>2.5</output>

<gadget id="calculator">10 / 2.5</gadget>
<output>4</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 1 * 3.5</gadget>
<output>14</output>

<gadget id="calculator">4 + 14</gadget>
<output>18</output>

<gadget id="calculator">4 + 11</gadget>
<output>15</output>

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

<gadget id="calculator">18 * (15/2)</gadget>
<output>135</output>

<result>135</result>