book Maths Puzzle Numerical Ability

How do I simplify this problem

3a + b/6a + 2b

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book Other Question

{(x+2)-y}{(X+2)+y}

is this a perfect square The curve y=ax^2 +bx+c passes through the points (x1,y1), (x2,y2), and (x3,y3). Show that the coefficients a, b, and c are a solution of the system of linear equations whose augme