In the given figure, A O B is a straight line. If ∠ A O C=(3 x-10)^∘, ∠ C O D=50^∘ and ∠ B O D=...

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In the given figure, A O B is a straight line. If ∠ A O C=(3 x-10)^∘, ∠ C O D=50^∘ and ∠ B O D=(x+20)^∘ then ∠ A O C= ?
(a) 40^∘
(b) 60^∘
(c) 80^∘
(d) 50^∘

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