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In a cyclic quadrilateral ABCD, it is ...

In a cyclic quadrilateral ABCD, it is being given that ` angle A = (x + y + 10)^(@), angle B = ( y + 20 ) ^(@), angle C = (x + y - 30 ) ^(@) and angle D = (x + y ) ^(@)`. Then, ` angle B ` ?

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