Melt and cast 50 conical billets with a base diameter of 30 cm and a height of 20 cm into a cylindrical steel material with a base diameter of 60 cm. How long is the steel in centimeters?
把50个底面直径都是30厘米，高20厘米的圆锥形钢坯，熔铸成一根底面直径是60厘米的圆柱形钢材．求钢材长多少厘米？
<gadget id="calculator">50 * 5 * 15 * 20</gadget>
<output>75_000</output>

<gadget id="calculator">75_000 / 900</gadget>
<output>250/3 = around 83.333333</output>

<result>250/3 = around 83.333333</result>