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Finola asked in Math

Question: A farmer reared a total of 306 cows and sheep in farm. 7/25 of the sheep were sold and another 45cows were bought. The number of cows was 7/9 the number of sheep after that (a) How many cows were there in the farm at first? Can u give me a few pointers on how to do this question but not tell me the answer I would really appreciate it thank you:)

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