A batch of fruit is shipped from the store, and (1/5) of this batch of fruit is sold on the first day, and (2/5) of this batch of fruit is sold on the second day, what percentage is left unsold?
商店运来一批水果，第一天卖了这批水果的(1/5)，第二天卖了这批水果的(2/5)，还剩几分之几没卖完？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) + (2/5)</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>