The area of a trapezoid is 68 square meters, the upper base is 10 meters, the height is 8 meters, and the lower base is how many meters.
一个梯形的面积是68平方米，上底是10米，高是8米，下底是多少米．
<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">68 * (1/4)</gadget>
<output>17</output>

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

<result>7</result>