There are a bunch of apples to be put into 4 boxes respectively, among which (1/4) is put into A box, (1/5) is put into B box, and the apples put into C box are exactly 4 times of the difference between the quantity of A and B boxes. So what percentage of the total number of apples are placed in the small box?
有一堆苹果要分别装入4个盒子里，其中(1/4)放入甲盒，(1/5)放入乙盒，放入丙盒的苹果正好是甲乙两盒数量差的4倍，那么丁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 / 3</gadget>
<output>1/3 = around 0.333333</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) * 4</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/3) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<result>13/60 = around 0.216667</result>