The area of a trapezoid is 35dm**2, the upper base is 3.5dm, the lower base is 6.5dm, and the height is dm.
一个梯形的面积是35dm**2，上底是3.5dm，下底是6.5dm，高是多少dm．
<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">35 * (1/5)</gadget>
<output>7</output>

<result>7</result>