There is a piece of land with an area of (7/8) hectares, (1/4) is planted with vegetables, (2/5) is planted with grain, and the rest is planted with fruit trees. How many hectares are planted with fruit trees?
有一块面积(7/8)公顷的地，(1/4)种蔬菜，(2/5)种粮食，其余的种果树．种果树的面积是多少公顷？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(7/8) * (7/20)</gadget>
<output>49/160 = around 0.30625</output>

<result>49/160 = around 0.30625</result>