In a rectangular parallelepiped refrigerator with a length of 20 cm and a width of 10 cm, there is water at a depth of 15 cm. Now put a block of iron into the water, and the water level rises to 18 cm. If 1 cubic centimeter of iron weighs 7.8 grams, how much does the block of iron weigh in kilograms? ?
在长20厘米、宽10厘米的长方体冰箱中有15厘米深的水，现在往水中放入一块铁块，水面上升到18厘米，如果1立方厘铁重7.8克，那么这块铁重多少千克？
<gadget id="calculator">18 - 15</gadget>
<output>3</output>

<gadget id="calculator">20 * 10 * 3 * 7.8</gadget>
<output>4_680</output>

<result>4_680</result>