An iron bar 80 decimeters long can just be welded into a rectangular parallelepiped frame with a length of 8 decimeters and a width of 5.5 decimeters after being cut. What is the height of this cuboid in decimeters.
一根80分米长的铁条，剪断后刚好可焊接成一个长8分米，宽5.5分米的长方体框架．这个长方体的高是多少分米．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">8 + 5.5</gadget>
<output>13.5</output>

<gadget id="calculator">20 - 13.5</gadget>
<output>6.5</output>

<result>6.5</result>