There are a bunch of candies, of which toffee accounts for 40%, and after adding 24 fruit candies, toffee only accounts for 25%. So, how many pieces of toffee are in this pile of sugar?
有一堆糖果，其中奶糖占40%，再放入24块水果糖后，奶糖就只占25%．那么，这堆糖中有奶糖多少块？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4)</gadget>
<output>4</output>

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

<gadget id="calculator">1 / (2/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 - (5/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">24 / (3/2)</gadget>
<output>16</output>

<result>16</result>