Pour 64 liters of water into a cuboid water tank with a length of 4 decimeters and a width of 2.5 decimeters, and it is just full. What is the depth of the water tank in meters?
把64升水倒入一个长4分米，宽2.5分米的长方体水箱内，正好倒满，这个水箱深是多少米．
<gadget id="calculator">4 * 2.5</gadget>
<output>10</output>

<gadget id="calculator">64 / 10</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>