In a mathematics 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.
closed as off-topic by mookid, AlexR, drhab, Claude Leibovici, Moishe Kohan Jan 12 '15 at 9:37
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