A rope 80 decimeters long wraps 4 times around a square table and it is less than 4 decimeters. What is the perimeter of the table in decimeters?
一根长80分米的绳子，在一张正方形桌子的四周绕4圈还差4分米，这个桌子的周长是多少分米．
<gadget id="calculator">80 + 4</gadget>
<output>84</output>

<gadget id="calculator">84 / 4 / 4</gadget>
<output>21/4 = around 5.25</output>

<result>21/4 = around 5.25</result>