If the lower base of a trapezoid is 60 cm, 3 times the upper base, and 1.5 times the height, what is the area of the trapezoid in square centimeters?
一个梯形的下底是60厘米，是上底的3倍，是高的1.5倍，则这个梯形的面积是多少平方厘米．
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 + 60</gadget>
<output>80</output>

<gadget id="calculator">60 / 1.5</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">80 * 20</gadget>
<output>1_600</output>

<result>1_600</result>