For a conical grain mound, Uncle Li measured that its bottom circumference is 12m, and its height is 1.5m. If each cubic meter of grain weighs about 55 kg, how many kilograms does this conical grain mound weigh? (Pi is taken as 3)
一个圆锥形谷堆，李叔叔量到它的底面周长是12m，高是1.5m，如果每立方米的谷约重55kg，这个圆锥形谷堆约重多少千克？(圆周率取3)
<result>33</result>