The area of a trapezoid is 70cm**2, the upper base is 4cm, and the lower base is 6cm. What is the height of the trapezoid?
一个梯形的面积是70cm**2，上底是4cm，下底是6cm，这个梯形的高是多少．
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">70 * (1/5)</gadget>
<output>14</output>

<result>14</result>