Pour 15 cubic decimeters of water into a cuboid container with a length of 3 decimeters, a width of 2 decimeters, and a height of 5 decimeters. How many decimeters is the water surface from the mouth of the tank?
把15立方分米的水倒入一个长3分米、宽2分米、高5分米的长方体容器内，水面距离缸口有多少分米．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">15 / 6</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">5 - (5/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>