snail climbs a bamboo pole several feet high, rises 1 meter during the day, and descends (2/3) meters at night. After reaching the top of the bamboo pole, it immediately descends and descends 2 (2/3) meters every day. It took a total of 16 days. Back to the ground, what is the length of the bamboo pole in meters?
一只蜗牛，爬若干尺高的竹竿，白天上升1米，夜间下降(2/3)米，到过竹竿顶端后，立即下降，每天下降2(2/3)米，总共用了16天，回到地面，竹竿的长是多少米．
<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">8 / 3</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">(1/3) + (8/3)</gadget>
<output>3</output>

<gadget id="calculator">39 / 3</gadget>
<output>13</output>

<gadget id="calculator">13 * (1/3)</gadget>
<output>13/3 = around 4.333333</output>

<gadget id="calculator">(13/3) + 1</gadget>
<output>16/3 = around 5.333333</output>

<result>16/3 = around 5.333333</result>