There is a rectangular box whose height and width are equal. If the length is shortened by 15 centimeters, it becomes a cube with a surface area of 54 square centimeters. What fraction of the length is the width of this cuboid box?
有个长方体铁盒，它的高与宽相等．如果长缩短15厘米，就成为表面积是54平方厘米的正方体，这个长方体盒的宽是长的几分之几？
<gadget id="calculator">3 + 15</gadget>
<output>18</output>

<gadget id="calculator">3 / 18</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>