A cuboid fuel tank with a length of 5 decimeters, a width of 0.4 meters and a height of 16 decimeters is filled with oil and poured into a rectangular parallelepiped container with a bottom side of 4 decimeters and a height of 25 decimeters. The height of the oil surface from the top of the fuel tank is How many?
长方体油箱，长5分米，宽0.4米，高16分米，注满油，倒入一个底面边长是4分米的正方形高25分米的长方体容器中，油面离油箱顶的高度是多少？
<gadget id="calculator">0.4 * 10 * 0.4 * 10</gadget>
<output>16</output>

<gadget id="calculator">16 / 16</gadget>
<output>1</output>

<gadget id="calculator">5 * 0.4 * 10 * 1</gadget>
<output>20</output>

<gadget id="calculator">23 - 20</gadget>
<output>3</output>

<result>3</result>