The area of the trapezoid is 480 square centimeters. If the height is 30 centimeters, what is the sum of the upper and lower bases?
梯形的面积是480平方厘米，若高是30厘米，那么上、下底的和是多少．
<gadget id="calculator">2 / 30</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">480 * (1/15)</gadget>
<output>32</output>

<result>32</result>