The area of a trapezoid is 36cm**2 its upper base is 3cm, its height is 8cm, what is its lower base.
一个梯形的面积是36cm**2它的上底是3cm，高是8cm，它的下底是多少．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">36 - 12</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>