Xiaohua cut a trapezoidal cardboard with an area of 60 square centimeters. The sum of its upper and lower bases is 15 cm. What is the height of this trapezoidal cardboard?
小华剪了一个面积是60平方厘米的梯形纸板，它的上底与下底的和是15厘米，这个梯形纸板的高是多少厘米？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">60 * (2/15)</gadget>
<output>8</output>

<result>8</result>