steel ingot is 5dm long, 2dm wide, and 1dm thick. A steel ingot weighs 7.8 kilograms per cubic decimeter. How many kilograms does this steel ingot weigh?
一块钢锭长5dm，宽2dm，厚1dm．每立方分米钢锭重7.8千克，这块钢锭重多少千克？
<gadget id="calculator">5 * 2 * 1 * 7.8</gadget>
<output>78</output>

<result>78</result>