In the given figure AOB is a straight line, the value of x is:

60 70 50 45

50

As AOB is a straight line so ∠AOC +∠BOC =180 x +55+ (2x -25) = 180 x+55+2x-25=180 3x +30=180 3x = 180-30 3x = 150 x = \(\frac{150}{3}\) = 50