The volume of a cylindrical bucket is 30L, the bottom area of the bucket is 5dm**2, and (3/4) bucket of water is filled, what is the height of the water surface in dm?
一个圆柱形水桶的容积是30L，水桶的底面积是5dm**2，装了(3/4)桶水，那么水面高是多少dm．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / 5</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">30 * (3/20)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>