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Mathematics

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the ratio of boys to girls in a classroom is 7:5 4 boys are added to the class the ratio is now 1:1 find the total number of girls in the class

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14 girls are in the class
the ratio 7:5 is divided by two so it can also be seen as 14:10. Add four boys and the ratio becomes 14:14 which is also 1:1

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