Hai kho thóc có tất cả 750 tấn thóc. Nếu chuyển 30 tấn thóc ở kho thứ nhất đi nơi khác thì số thóc còn lại của hai kho bằng nhau. Hỏi lúc đầu mỗi kho có bao nhiêu tấn thóc?

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