A trapezoidal formwork has an area of 16 square meters, a height of 4 meters, a lower bottom of 2.5 meters, and an upper bottom of 2.5 meters.
一块梯形模板面积是16平方米，高4米，下底2.5米，上底多少米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">16 - 5</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>