Beibei wanted to know the circumference of a tree. She took a 5-meter-long rope and wrapped it around the trunk for 8 weeks, leaving 2 decimeters. How long is the trunk of this tree in decimeters per week?
贝贝想知道一颗树的周长，她拿来一根5米长的绳子，在树干上绕了8周后余下2分米．这棵树干一周长多少分米．
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">50 - 2</gadget>
<output>48</output>

<gadget id="calculator">48 / 8</gadget>
<output>6</output>

<result>6</result>