If x ∶ y = ∶ 9 and ∶ z = 4 ∶ 7, then x ∶ y ∶ z is:

1
30 ∶ 36 ∶ 81
2
36 ∶ 30 ∶ 81
3
20 ∶ 36 ∶ 63
4
20 ∶ 63 ∶ 36

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