In a vegetable field, its (1/5) was planted on the first day, and its (2/5) was planted on the second day, what percentage was planted in the two days? What percentage is left?
一块菜地，第一天种了它的(1/5)，第二天种了它的(2/5)，两天一共种了几分之几？还剩几分之几没有种？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>