A cylindrical steel pipe is 30 cm long, its outer diameter is one-third of its length, and its wall thickness is 1 cm. It is known that the steel weighs 7.8 grams per cubic centimeter. How many grams does this steel pipe weigh?
一根圆柱形钢管，长30厘米，外直径是长的三分之一，管壁厚1厘米，已知每立方厘米的钢重7.8克，这根钢管重多少克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / 2</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">25 - 16</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 30</gadget>
<output>847.8</output>

<gadget id="calculator">7.8 * 847.8</gadget>
<output>6_612.84</output>

<result>6_612.84</result>