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With considerable difficulty!

With a 30 cm ruler you can easily ascertain that the length is between 2 and 3 ruler-lengths: 600 mm and 900 mm. Maybe you can judge that the the remainder, after 600 mm is less than half of the 30 cm ruler. So that tells you that it is between 600 mm and 750 mm.

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Wiki User

12y ago

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well i aint know

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Jacob DaLal

Lvl 2
4y ago
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Q: How do you measure 720 mm with a 30 cm ruler?
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