The area of a trapezoid is 40cm**2, the upper base is 3.5cm, the lower base is 6.5cm, what is the height
一个梯形的面积40cm**2，上底是3.5cm，下底是6.5cm，高是多少
<gadget id="calculator">3.5 + 6.5</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * (1/5)</gadget>
<output>8</output>

<result>8</result>