The ratio of the upper base to the lower base of a right-angled trapezoid is 2:7. 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 the original trapezoid.
一个直角梯形的上底与下底的比是2：7．如果上底延长11米，下底延长1米，就变成了一个正方形．求原梯形的面积．
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 7</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>