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ABCD is a cyclic quadrilateral such that...

ABCD is a cyclic quadrilateral such that `/_A = ( 4y + 20) ^(@), /_B = ( 3y - 5)^(@), /_C = ( 4x)^(@) ` and `/_ D = ( 7x + 5)^(@)` . Find the four angles.

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The correct Answer is:
`:. /_ A = 120^(@), /_ B = 70^(@) , /_ C = 60^(@), /_D = 110^(@)`
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