exam Maths Puzzle Numerical Ability

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Determin "k" if -2 is a root of

2x^2+ kx +2 =0

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exam Other Question

Mixing water and antifreeze: How much water should be added to i gallon of pure antifreeze to obtain a solution that is 60% antifreeze?

I need help setting this problem up.
3x-x+8=16