Mom was doing laundry. Last week I used up this bag of washing powder (3/10), and this week I used it up (5/10). How much of this bag of laundry detergent did you share in two weeks? What percentage of this bag of laundry detergent is the rest less than what was used this week?
妈妈洗衣服，上星期用去了这袋洗衣粉的(3/10)，这星期用去了它的(5/10)．两星期共用了这袋洗衣粉的几分之几？剩下的比这星期用去的少这袋洗衣粉的几分之几？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

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