Grandpa Zhang’s family has a piece of land. He uses (2/9) of this land to grow soybeans, (2/5) to grow corn, and the rest to grow cotton. What percentage of the land is planted with cotton?
张爷爷家有一块地，他用这块地的(2/9)种大豆，(2/5)种玉米，其余的种棉花，种棉花的面积占这块地的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

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

<gadget id="calculator">1 - (2/9) - (2/5)</gadget>
<output>17/45 = around 0.377778</output>

<result>17/45 = around 0.377778</result>