cube container with a side length of 5 cm contains some water and an iron block. The height of the water surface is 10 cm. After taking out the iron block, the height of the water surface is 6 cm. What is the volume of the iron block? If iron weighs 7.8 grams per cubic centimeter, how much does the iron weigh?
一个棱长为5厘米的正方体容器，里面装有一些水和一个铁块，水面高度为10厘米，取出铁块后水面高度为6厘米，铁块的体积是多大？如果每立方厘米铁重7.8克，这块铁有多重？
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">5 * 5 * 4</gadget>
<output>100</output>

<gadget id="calculator">7.8 * 100</gadget>
<output>780</output>

<result>780</result>