The area of a trapezoid is 40 square centimeters. If its upper and lower bases are doubled and its height tripled, what is its area?
一个梯形的面积是40平方厘米，如果它的上底和下底都扩大到原来的2倍，高扩大到原来的3倍，则它的面积是多少．
<gadget id="calculator">40 * 3 * 2</gadget>
<output>240</output>

<result>240</result>