If x, x-y and x+y are the angles of a triangle (not an equilateral triangle) such that (x-y), x and (x+y) are in GP, then what is x equal to?

NDA 2018 Mathematics question

If x, and are the angles of a triangle (not an equilateral triangle) such that , and are in GP, then what is x equal to?

Answer: (B)

The angles of a triangle add up to : . Hence .

Question ID VK-028852