Cuối học kì II,khối 6 của 1 trường có 3 loại hs:giỏi,khá,trung bình.số hs giỏi=\(\dfrac{5}{9}\)số hs cả khối.số hs khá bằng \(^{\dfrac{1}{3}}\) số hs cả khối.Biết số hs trung bình là 13 hs.

a.Tính số hs khối 6.

b.Tính số hs khá khối 6 của trường

c.Hs giỏi chiếm bn phần trăm số hs cả khối?

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