The upper base of a trapezoid is 2.5 cm, the lower base is 7.5 cm, the area is 70 cm2, and the height is in cm.
一个梯形的上底是2.5厘米，下底是7.5厘米，面积是70平方厘米，高是多少厘米．
<gadget id="calculator">7.5 + 2.5</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>