There is a large pool in the backyard of Tong Li’s home. One day, 8-year-old Tong Li took a dry wooden stick and inserted it vertically into the bottom of the water, and found that the wooden stick was 50cm wet. Then she turned the wooden stick upside down and inserted it into the bottom of the water vertically. At this time, the wet part was 20cm longer than half of the wooden stick. So how long is the wooden stick held by Tong Li in cm?
童丽家后院有一个大水池，一天8岁的童丽，拿来一根干木棍竖直地插入水底，发现木棍湿了50cm．然后她将木棍倒转竖直地插入水底，这时湿的部分总共比木棍的一半长20cm，那么童丽拿的那根木棍长多少cm．
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">80 / (1/2)</gadget>
<output>160</output>

<result>160</result>