If ABCD be a cyclic quadrilateral in whi...

If ABCD be a cyclic quadrilateral in which `angleA = 4x^@`, `angleB = 7x^@`, `angleC = 5y^@ & angleD = y^@`, then x, y is___

A

3 : 4

B

4 : 3

C

5 : 4

D

4 : 5

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