A cuboid of steel is 3 meters long and has a cross-sectional area of 25 square centimeters. Steel weighs 7.8 kilograms per cubic decimeter. How many kilograms does this piece of steel weigh?
一根长方体钢材，长3米，横截面的面积是25平方厘米．每立方分米钢重7.8千克，这根钢材重多少千克？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 3 * 10 * 7.8</gadget>
<output>58.5</output>

<result>58.5</result>