A cube fish tank, side length 4 decimeters. If a full tank of water is poured into an empty cuboid tank with a length of 8 decimeters and a width of 5 decimeters, how deep is the water in the tank?
一个正方体鱼缸，棱长4分米．如果把满缸水倒入一个里面长8分米，宽5分米的长方体空水槽里，这时水槽里的水有多少深？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">4 / 40</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4 * 4 * (1/10)</gadget>
<output>8/5 = around 1.6</output>

<result>8/5 = around 1.6</result>