Use a 90 decimeter long iron wire to form a wide frame of a cube. What is the length of each edge of the cube frame?
用一根长90分米的铁丝，围成一个正方体的宽架，这个正方体的框架的每条棱长是多少分米？
<gadget id="calculator">90 / 12</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>