Pour 112L of water into a fish tank with a length of 7dm; a width of 4dm; and a height of 5dm. How many decimeters is the water surface from the side of the tank?
把112L水倒入长7dm；宽4dm；高5dm的鱼缸内，这时水面距缸边有多少分米？
<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">112 / 28</gadget>
<output>4</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<result>1</result>