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Human hair grows at a rate of about $1$ centimetre per month. This is equivalent to about how many millimetres every ten years?

Pick one

A $12$ B $120$ C $1 200$ D $12 000$ E $120 000$

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Official solution

C $1$ cm per month $= 10$ mm per month $= 120$ mm per year $= 1\,200$ mm in ten years

Source: MathNet, licensed CC-BY-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.