There are two kinds of candies, fruit candy and milk candy in the candy box. The quantity ratio of fruit candy to toffee is 3:4. After Xiaoming takes 4 fruit candies, fruit candy accounts for 20% of the total candies. How many toffees are there?
糖果盒里有水果糖和奶糖两种糖果．水果糖和奶糖的数量比是3：4，小明拿走了4颗水果糖后，水果糖占糖果总数的20%，奶糖有多少颗？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/5) / (4/5)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2)</gadget>
<output>8</output>

<result>8</result>