book Maths Puzzle Numerical Ability

I am currently reviewing for a placement test and have not taken any math courses in nearly 3 years. I know that I have learned to do all of the topics included in the sample prob

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which is an example of a proportion? 2/3, n=1/2, 2/5=a/15,or none of these? (thank you for the help!!!!!!!!!!!!) decide what values of the variable cannot possible be solutions for each equation. do not solve. (5)/(2x+3) + (1)/(x-6) = 0 . if just need to know how to do it. i dont want the an