The area of a trapezoid is 120 square centimeters, the sum of its upper and lower bases is 3 decimeters, what is its height?
一个梯形的面积是120平方厘米，它的上、下底的和是3分米，高是多少．
<gadget id="calculator">120 / 100</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(6/5) * (2/3)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>