The area of a trapezoid is 75 square meters, the height is 12.5 meters, the upper base is 5 meters, and the lower base is how many meters.
一个梯形的面积是75平方米，高是12.5米，上底是5米，下底是多少米．
<gadget id="calculator">2 / 12.5</gadget>
<output>0.16</output>

<gadget id="calculator">75 * 0.16</gadget>
<output>12</output>

<gadget id="calculator">12 - 5</gadget>
<output>7</output>

<result>7</result>