A bamboo pole is inserted into the water and gets wet by 30cm. The bamboo pole is turned around and inserted into the water. This time the wet part of the bamboo pole is 12cm longer than its (1/3) length. How long is this bamboo pole?
一根竹竿插入水中湿了30cm，将竹竿掉头插入水中，这次竹竿湿的部分比它的(1/3)长12cm，这根竹竿长多少？
<gadget id="calculator">30 - 12</gadget>
<output>18</output>

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

<gadget id="calculator">18 / (1/3)</gadget>
<output>54</output>

<result>54</result>