After a cylindrical steel with a length of 8 decimeters is cut into two small cylinders, the surface area increases by 20 square centimeters compared to the original one. It is known that the steel weighs 7.8 grams per cubic centimeter. How many grams does the two small steel pieces weigh in total?
将一个长8分米的圆柱形钢材，切割成两节小圆柱后，表面积比原来增加了20平方厘米，已知每立方厘米钢重7.8克，则这两节小钢材共重多少克？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">8 * 10</gadget>
<output>80</output>

<gadget id="calculator">10 * 80 * 7.8</gadget>
<output>6_240</output>

<result>6_240</result>