Question
Supply the missing information for diagram.
✓
Answer
If $x\ cm$ long piece is inserted in $(x4)$ and $(x3)$ hooked machine, repeated machine, then it will produce $36\ cm$ long piece. So, $x \times 4 \times 3 = 36$
$ \Rightarrow x = 3\ cm$
$ \Rightarrow x = 3\ cm$
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