A cuboid square steel has a cross-section of a square with side length 3 cm, and the length of the square steel is 2.5 meters. If the steel weighs 7.5 kg per cubic decimeter, how many kilograms does this square steel weigh?
一根长方体方钢，横截面是边长3厘米的正方形，方钢长2.5米，如果每立方分米的钢重7.5千克，这根方钢重多少千克？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2.5 * 10</gadget>
<output>25</output>

<gadget id="calculator">(3/10) * (3/10) * 25 * 7.5</gadget>
<output>16.875</output>

<result>16.875</result>