For a trapezoidal land, the upper base is the lower base (2/3), the lower base is high (9/14), and the upper base is 18m. If (5/9) of this land is used to build an activity center for the elderly, how many square meters will the activity center for the elderly occupy?
一块梯形地，上底为下底的(2/3)，下底是高的(9/14)，上底是18m．如果用这块地的(5/9)建一个老年活动中心，老年活动中心占地多少平方米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 * (2/3)</gadget>
<output>12</output>

<gadget id="calculator">18 + 12</gadget>
<output>30</output>

<gadget id="calculator">9 / 14</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">(2/3) / (9/14) / 2</gadget>
<output>14/27 = around 0.518519</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">30 * 18 * (14/27) * (5/9)</gadget>
<output>1_400/9 = around 155.555556</output>

<result>1_400/9 = around 155.555556</result>