A piece of land has (7/8) hectares, of which (1/4) is planted with soybeans, (1/2) is planted with cotton, and the rest is planted with corn. What percentage of the land is planted with corn?
一块地有(7/8)公顷，其中(1/4)种大豆，(1/2)种棉花，其余的种玉米．种玉米的面积占这块地的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/4) + (1/2)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>