The area of a trapezoid is 75cm**2, the height is 6cm, the bottom is 15cm, what is the top bottom?
一个梯形的面积是75cm**2，高是6cm，下底是15cm，上底是多少．
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">75 * (1/3)</gadget>
<output>25</output>

<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<result>10</result>