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Passage I: The angle of a quadrilateral ...

Passage I: The angle of a quadrilateral are in the ratio 3:5:7:9.
If measure of angles be (3x),(5x),(7x) and (9x), then the value of x is

A

`20^(@)`

B

`15^(@)`

C

`25^(@)`

D

`10^(@)`

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