There are two packs of candy, and each pack contains toffee, fruit candy and chocolate candy. In the first pack, toffee accounts for 25%, and in the second pack, fruit candy accounts for 50%. The number of candies in the first pack is the second (2/3) of the number of sugar packets, the percentage of chocolate candy in the first packet of sugar is twice that of the second packet of sugar, when the two packets of sugar are combined, chocolate candy accounts for 28% , what percentage of fruit sugar? (Please use the equation and combine the mathematical method to solve it)
有两包糖，每包糖内都有奶糖、水果糖和巧克力糖，第一包中奶糖占25%，第二包中水果糖占50%，第一包糖的粒数是第二包糖的粒数的(2/3)，巧克力糖在第一包糖中所占百分数是第二包糖中所占百分数的2倍，当两包糖合在一起时，巧克力糖占28%，水果糖占百分之几？(请用方程并结合设数法解答)
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">28 / 100</gadget>
<output>7/25 = around 0.28</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/2) * (1/2)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">(7/25) / (7/4)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">1 + (3/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(4/25) * (5/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(7/20) + (3/4)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) / (5/2)</gadget>
<output>11/25 = around 0.44</output>

<result>11/25 = around 0.44</result>