Mathematics

Mathematics

Problem

Lines AB and CD intersect at O. The four angles, taken in order around O, are: ∠AOC = (3x + 10)°, ∠COB = (2y − 20)°, ∠BOD = (5x − 30)°, ∠DOA = (y + 50)°. What is the value of x? a) 2525 b) 1515 c) 2020 d) 1818

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