A piece of land is (9/10) hectares, of which (1/10) is planted with cucumbers, (3/10) is planted with eggplants, and the rest is planted with winter melons. What fraction of the area of winter melons is in this land?
一块地(9/10)公顷，其中(1/10)种黄瓜，(3/10)种茄子，其余的种冬瓜，冬瓜的面积占这块地的几分之几？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/10) - (3/10)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>