The farm cultivates fruit saplings in a field. In the afternoon, (7/15) planted peach trees in this field, (1/5) planted peach trees, and the rest planted apple trees. The area of apple trees accounts for a fraction of the field. Several?
农场在一块地里培育果树苗，下午整修了这块地的(7/15)栽桃树，(1/5)栽桃树，其余栽苹果树，苹果树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>