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2015-01-31T12:52:07+08:00

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Ratio of boys to girls is 12:30 or 2:5
ratio of girls to boys is 30:12 or 5:2
ratio of boys to the class is 12:(30+12) or 12:42 or 2:7
ratio of girls to the class is 30:(12:30) or 30:42 or 5:7
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