The volume of a cylindrical bucket is 30 liters, and the area of the bottom measured from the inside is 5 decimeters squared. If it contains (4/5) buckets of water, how many decimeters is the water surface high?
一个圆柱形水桶的容积是30升，从里面量底面积是5平方分米，装(4/5)桶水，水面高多少分米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 5</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">30 * (4/25)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>