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kieuduong1612
2 năm trước
Hiện nay tuổi cha gấp 4 lần tuổi con. Đến năm tuổi con gấp đôi tuổi con hiện nay thì tổng số tuổi của hai cha con là 91. Hỏi tuổi cha hiện nay là bao nhiêu?
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