book Maths Puzzle Numerical Ability

hi! hope someone can help me with problems...with solutions please. thanks so much!!!

30) There are 300 people in John’s graduating class. 40% of them went to the Senior Prom w

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book Other Question
express as a polynomial: ((x^2-xy)/(2x))*(2x+6y)=
i get x^2+2xy-3y^2 1/(x+3) + 1/(x-3) = 1/ (x^2-9)