A rope is folded twice and put into the well. One end touches the bottom of the well, and the other end protrudes 1 meter from the well head. The rope exposed outside the well accounts for (1/6) of the rope. How deep is the well in meters?
一根绳子对折两次后放入井中，一端接触井底，另一端露出井口1米，露在井外的绳子占这根绳子的(1/6)．井深多少米．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">4 / (1/6) / 4</gadget>
<output>6</output>

<gadget id="calculator">1 * 6</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<result>5</result>