The area of the trapezoid is 54 square meters, the height is 6 meters, the upper base is 8 meters, and the lower base is how many meters.
梯形的面积是54平方米，高是6米，上底是8米，下底是多少米．
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">54 * (1/3)</gadget>
<output>18</output>

<gadget id="calculator">18 - 8</gadget>
<output>10</output>

<result>10</result>