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The angles of a quadrilateral are in the ratio 3:4:5:6. Find the angles of the quadrilateral.
A. 40∘ , 100∘ , 80∘ , 140∘
B. 60∘ , 80∘ , 100∘ , 120∘
C. 30∘ , 40∘ , 50∘ , 60∘
D. 10∘ , 20∘ , 30∘ , 40∘