Uncle Zhang has a rectangular vegetable field with a total area of 450 square meters. He uses (2/9) of this field to grow cucumbers and (1/3) of this field to grow eggplants. The area for eggplants is larger than the area for cucumbers. How many square meters?
张叔叔有一块长方形菜地，共450平方米，他用这块地的(2/9)种黄瓜，用这块地的(1/3)种茄子，种茄子的面积比种黄瓜的面积多多少平方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/3) - (2/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">450 * (1/9)</gadget>
<output>50</output>

<result>50</result>