যদি X ∶ Y = 4 ∶ 5 , Y ∶ Z = 5 ∶ 7 এবং Z ∶ W = 7 ∶ 9 হয়, তাহলে X ∶ W কত হবে?

1
2 ∶ 9
2
4 ∶ 9
3
3 ∶ 11
4
3 ∶ 7

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