Using an iron wire 80 cm long, it can be welded into a rectangular parallelepiped frame whose length and width are 6 cm and how many centimeters is high. (not counting joints)
用一根长80厘米的铁丝，能焊接成一个长和宽都是6厘米、高是多少厘米的长方体框架．(接头处不计)
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<result>8</result>