There are two rectangular parallelepiped glass tanks, A and B, measured from the inside. Their depths are equal, and the bottoms are squares with side lengths of 4 decimeters and 5 decimeters respectively. Now fill tank A with water and pour it into tank B. The water surface is deeper than tank B. 4/5 of it is 0.48 decimeters lower, how many decimeters is the depth of the glass tank?
有甲乙两个长方体玻璃缸从里面量，它们的深度相等，底面分别是边长4分米和5分米的正方形，现将甲缸盛满水后，倒入乙缸，水面比乙缸深度的4/5还低0.48分米，玻璃缸深多少分米？
<gadget id="calculator">5 * 5 * 0.48</gadget>
<output>12</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 * 5 * (4/5)</gadget>
<output>20</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<result>3</result>