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7 boys have a mean height of 1.80m. Peter joins the boys and now the mean height is 1.75m. Find Peter's height.

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    Do you **really** mean $18$ metres?! Are you sure that it isn’t $1.80$ m, or $180$ cm?2012-10-02
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    I think you are having some problems with your units. I have never met someone who is $18$ metres tall.2012-10-02

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