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Phân số chỉ 20 con gà là: \(1-\dfrac{1}{3}=\dfrac{2}{3}\)(số gà còn lại sau lần 1)
Số gà còn lại sau lần 1 là: \(20:\dfrac{2}{3}=30\left(con\right)\)
Số gà người đó bán được là: \(30:\left(1-\dfrac{3}{8}\right)=48\left(con\right)\)
Người đó bán được:
\(20:\left(1-\dfrac{3}{8}-\dfrac{5}{8}\cdot\dfrac{1}{3}\right)=48\left(quả\right)\)