Pour 60 liters of water into a fish tank with a length of 5 decimeters, a width of 4 decimeters, and a height of 4 decimeters. How many decimeters are there between the water surface and the mouth of the tank?
把60升水倒入长5分米、宽4分米、高4分米的鱼缸内，水面距缸口还有多少分米．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<result>1</result>