exam Maths Puzzle Numerical Ability

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3x^2 - 6x - 3 = 12 - 6x

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I need help understanding this, Please help. P Varies Directly as R and inversly as the square of S. If P = 175 and R = 252, and S = 6, Find P When R = 196 and S = 7 How much antifreeze must be added to a 10 gallon of 20% antifreeze to make 50% antifreeze solution?