One end of a bamboo pole is inserted into the water, 1.2 meters is wet, and the other end is inserted, the part that is not wet is half of the total length and 0.4 meters less, find the length of the part that is not wet.
一根竹竿，一头伸进水里，有1.2米湿了，另一头伸进去，现没湿部分是全长的一半少0.4米，求没湿部分的长度．
<gadget id="calculator">1.2 * 2</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 - 0.4</gadget>
<output>2</output>

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

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

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

<gadget id="calculator">2 - 0.4</gadget>
<output>1.6</output>

<result>1.6</result>