There are some candies that need to be packed into 5 bags respectively, among which (1/4) is put into box A, (1/5) is put into box B, and the apples put into box C are exactly 3 times the difference between the two boxes of A and B. times, the amount of candies put in box D is exactly the sum of the numbers of boxes B and C, so what percentage of the total number of apples put in box E?
有一些糖果要分别装入5个袋子里，其中(1/4)放入A盒，(1/5)放入B盒，放入C盒的苹果正好是A，B两盒数量差的3倍，放入D盒的糖果正好是B和C盒数量和，那么E盒里放入的苹果占总数的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 3</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/5) + (3/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (1/4) - (1/5) - (3/20) - (7/20)</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>