basket of fruits weighs 45 kg in total. After 40% of the fruit is sold, the weight of the basket is 28 kg. How much does the weight of the basket weigh?
一筐水果，连筐共重45千克，卖出水果的40%以后，连筐还重28千克，求筐重多少千克？
<gadget id="calculator">45 - 28</gadget>
<output>17</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">17 / (2/5)</gadget>
<output>85/2 = around 42.5</output>

<gadget id="calculator">45 - (85/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>