It is known that the upper base of a trapezoid is 4 cm, the length of the lower base is twice the length of the upper base, and the area is 60 cm2. What is the height of the trapezoid in cm?
已知一个梯形的上底是4厘米，下底长是上底长的2倍，面积是60平方厘米，这个梯形的高是多少厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">60 * (1/6)</gadget>
<output>10</output>

<result>10</result>