$$ABCD$$ is a quadrilateral where the points $$A$$, $$B$$ and $$C$$ fall on the circle. $$\angle BCD$$ is decreased by $$x$$ degree such that $$D$$ also falls on the circle. If $$\angle ABC = 120^\circ$$ and the final value of $$\angle ADC$$ is triple the initial value, then what is the value of $$x$$ in degree.