Pour 30 liters of water into a cuboid fish tank with a length of 5 decimeters, a width of 3 decimeters, and a height of 4 decimeters. How many decimeters is the water surface from the mouth of the tank?
把30升水倒入长5分米、宽3分米、高4分米的长方体鱼缸内，水面距缸口多少分米．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">30 / 15</gadget>
<output>2</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<result>2</result>