book Maths Puzzle Numerical Ability

Instructions: For questions 30 and 31 use quadrilateral DEFG inscribed in the circle. If m < GFE = 2x, m < FGD = 2x-12 and m < EDG = 2x + 20 find each measure.
Problems: 1. m < GF

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7x-20= 6y

-4x-2y= -44

solve the system Find S(with a sideways 8 beside it) if an=27(1/3)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me.