The area of a trapezoid is 34 square meters, the height is 4 meters, the length of the lower base is 10 meters, and the length of the upper base is how many meters.
一个梯形的面积是34平方米，高是4米，下底长10米，上底长多少米．
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">34 * (1/2)</gadget>
<output>17</output>

<gadget id="calculator">17 - 10</gadget>
<output>7</output>

<result>7</result>