Teacher Zhang led the students of class 3 and 2 to a well to do an experiment. First, he inserted a wooden stick vertically into the bottom of the water and found that it was 15 cm wet. Then he turned the stick upside down and inserted it vertically into the bottom of the water. A total of 6 cm more than half the length of the stick. So, how long is the stick in centimeters?
张老师带领三2班的同学来到一口水井边做实验，首先将一根木棍竖直插入水底，发现湿了15厘米，再将这根木棍倒转竖直插入水底，两次木棍湿的部分总共比木棍长度的一半多6厘米．那么，这根木棍长多少厘米．
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 6</gadget>
<output>24</output>

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

<gadget id="calculator">24 / (1/2)</gadget>
<output>48</output>

<result>48</result>