The volume of a cylindrical bucket is 20 cubic decimeters, and (2/5) of water is filled in it. It is known that the area of the bottom is 6 square decimeters. What is the height of the water surface in decimeters?
一个圆柱形水桶容积是20立方分米，里面装了(2/5)的水，已知底面积为6平方分米，水面高是多少分米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 6</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">20 * (1/15)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>