ANSWERS: 4
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Yes.
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Brazil uses the International System of Units (SI), the modern form of the metric system: http://www.bipm.fr/en/si/ http://en.wikipedia.org/wiki/SI Brazil signed the Metre Convention in 1921: http://www.bipm.fr/en/convention/member_states/br/
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Yes,the only two countries that don't use it is USA,and the UK.
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Yes, they do.
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