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Find `angle A` of a cyclic quadrilateral `ABCD` in which `angleA= (4x+20)^@, angleB = (3x - 5)^@, angleC = (4y)^@ and angleD = (7y + 5)^@.`

A

`70^@`

B

`60^@`

C

`120^@`

D

`110^@`

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The correct Answer is:
C
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