A divided by B equals 0.4, B divided by C equals 2, and the ratio of a: C is ()

If a divided by B equals 0.4, then B = 2.5A, substituting B divided by C equals 2, we get
2.5a÷c=2
So a △ C = 2 △ 2.5 = 4 △ 5
So the ratio of a: C is 4:5

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