book Maths Puzzle Numerical Ability

solve: y^4 - 3y^3 - 2y^2 + 10y - 12 = 0; 1 + i

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A solution of ethyl alcohol that is 70% alcohol by weight is to be used as a bactericide. The solution is to be made by adding water to a 95% ethyl alcohol solution. How many grams The formula is 1020 squre root of P(1-.01square root of P)=G. P is the population in thousands,this formula is the amount of water in gallons per minute the city needs.
A city