The area of a trapezoid is 68.4 square decimeters, and the sum of the upper and lower bases is 36 decimeters. What is the height of the trapezoid in centimeters?
一个梯形的面积是68.4平方分米，上底与下底之和是36分米，这个梯形的高是多少厘米．
<gadget id="calculator">2 / 36</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">68.4 * (1/18) * 10</gadget>
<output>38</output>

<result>38</result>