cau do qua trung

Ai co the giai duoc cau do nay xin gui ve dia chi email cua toi nha! 1 ba cu gia di ban trung. Ba mang ro trung di ra cho ban. Ngay dau tien ba ban duoc 1/2 tong so trung trong ro roi ba cho di 1 nua qua. Ba mang trung ve. Ngay thu 2 ba mang so trung con lai di ban va cung ban duoc 1/2 so trung con lai trong ro do va cung cho di 1 nua qua roi mang trung ve. cu nhu vay ba di ban 4 ngay thi het trung. Hoi ba da ban duoc bao nhieu qua trung?

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