In a well, the height of the water surface accounts for 60% of the depth of the well. It is known that the water surface is 8 meters away from the well head. How deep is the well?
一口水井，水面的高度占井深的60%，已知水面距离井口有8米，这口井深多少米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 / (2/5)</gadget>
<output>20</output>

<result>20</result>