In the given figure, E A D ⊥ B C D. Ray F A C cuts ray E A D at a point A such that ∠ E A F=30^∘....

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In the given figure, E A D ⊥ B C D. Ray F A C cuts ray E A D at a point A such that ∠ E A F=30^∘. Also, in B A C, ∠ B A C=x^∘ and ∠ A B C=(x+10)^∘. Then, the value of x is
(a) 20
(b) 25
(c) 30

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