In a vegetable field (4/5) hectares, the area for cucumbers accounts for (1/6), the area for eggplants accounts for (1/3), and the rest of the vegetable field is used for growing tomatoes. What percentage of the land is used to grow tomatoes?
一块菜地(4/5)公顷，种黄瓜的面积占这块地的(1/6)，种茄子的面积占这块地的(1/3)，余下的菜地用来种西红柿．用来种西红柿的面积占了这块地的几分之几？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/6) - (1/3)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>