The farm cultivates fruit tree seedlings in a field with an area of 100 hectares. (7/15) of this field is planted with peach trees, (1/5) is planted with pear trees, and the rest are planted with apple trees. What percentage?
农场在一块面积是100公顷的地里培育果树苗，这块地的(7/15)栽桃树，(1/5)栽梨树，其余栽苹果树，苹果树的面积占这块地的几分之几？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (7/15) - (1/5)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>