piece of cloth, which is used to make clothes (1/5), and which is used to make bed sheets (2/5). How much of this piece of cloth is used in total? How much of this cloth is left?
一块布，做衣服用去这块布的(1/5)，做床单用去这块布的(2/5)．一共用去这块布的几分之几？还剩这块布的几分之几？
<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>