bamboo pole is inserted into the water, the part in the mud occupies (3/7) of the total length, and the part above the water occupies (3/7) of the total length, what fraction of the bamboo pole is the depth of the water?
一根竹竿，插入水中，入泥部分占全长的(3/7)，露出水面的部分占全长的(3/7)，水的深度占竹竿的几分之几？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>