A piece of square steel is 2.5 meters long and its cross section is a square with side length 6 cm. How much does this piece of steel weigh? (7.8 kg per cubic decimeter of steel)
一段方钢，长2.5米，横截面是边长6厘米的正方形．这段钢材有多重？(每立方分米钢重7.8千克)
<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2.5 * 10 * (3/5) * (3/5) * 7.8</gadget>
<output>70.2</output>

<result>70.2</result>