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In a math club, there were 8 girls for every 5 boys. When 19 boys and 4 girls were added, the ratio became 9 girls for every 7 boys. How many girls were there at the start?

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Estremadurajuneid
From the start it has 104 girls and 65 boys. The ratio is 104:65 at first or equivalent when we simplify to 8:5. (104+4):(65+19) 108:84 9:7