The box is tightly packed with [[$ 12 $]] rectangular pieces of chalk with a square cross-section. The volume of the inside of the box is [[$ 230 $]] cm [[$ ^ 3 $]]. Specify the length of the chalk when the side length of the cross-sectional square is [[$ 1.5 $]] cm. (Source: Entrance examination for technical training, spring 1992)

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Answer: The length of the chalk is cm.