The area of a trapezoidal land is 2400 square meters, the height is 60 meters, the length of the upper base is 27 meters, how many meters is the length of the lower base? (column equation solution)
一块梯形地的面积是2400平方米，高60米，上底长27米，下底长多少米？(列方程解答)
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">27 * 30</gadget>
<output>810</output>

<gadget id="calculator">2_400 - 810</gadget>
<output>1_590</output>

<gadget id="calculator">1_590 / 30</gadget>
<output>53</output>

<result>53</result>