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trongdzvl73
2 năm trước
người ta cho một vòi nước chảy vào bể chưa có nước. Lần thứ nhất chảy được 2/5 bể nước. Lần thứ hai chảy được 3/7 bể nước. Sau 2 lần chảy đó,trong bể vẫn còn thiếu 120 lít nước nữa thì bể mới đầy. Hỏi bể đầy chứa bao nhiêu lít nước
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