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03-09-2014
Mathematics

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At summer camp the ratio of boys to girls was 7:2 If there were 21 boys how many girls were there?

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03-09-2014

[tex]Ratio:\\7:2\\\\ 7x-number\ of\ boys\\2x-number\ of\ boys\\\\ 7x=21\ \ \ |:7\\ x=3\\\\ 2x=2*3=6\\ Number\ of\ girls\ is\ equal\ to\ 6.[/tex]

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