Hai cửa hàng cùng bán được một số tấn gạo như nhau.cửa hàng thứ nhất bán hết trong 5 ngày ,mỗi ngày bán được số tấn gại như nhau.cửa hàng thứ hai bán hết trong 8 ngày ,mỗi ngày bán được số tấn gạo như nhau .sau hai ngày bán ,số tấn gạo còn lại của cửa hàng thứ hai hơn số tấn gạo còn lại của cửa hàng thứ nhất là 18 tấn .hỏi mỗi kho ban đầu có bao nhiêu tấn gạo ?

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