The area of a trapezoid is 40 square meters and the height is 5 meters. What is the sum of the upper and lower bases?
一个梯形的面积是40平方米，高是5米，上底和下底的和是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 * (2/5)</gadget>
<output>16</output>

<result>16</result>