A piece of square steel is 20 cm long, its cross-section is a square with a side length of 1.5 cm, and the steel weighs 7.8 grams per cubic centimeter. How much does this square bar weigh in grams?
一根方钢，长20厘米，它的横截面是边长1.5厘米的正方形，每立方厘米钢重7.8克．这根方钢重多少克？
<gadget id="calculator">1.5 * 1.5 * 20 * 7.8</gadget>
<output>351</output>

<result>351</result>