exam Maths Puzzle Numerical Ability

A solution of turpentine and alcohol contains 15 ounces of turpentine and 45 ounces of alcohol. How much pure turpentine must be added to produce a solution that is 75 percent turpentine?

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exam Other Question

If x=1 and x= -8 then form a quadratic equation. Could you please give me some help with this, I thought I needed to know three things to make a quadratic equation so I am confused. Solve the following quadratic equation by completing the square:

x^2 - 6x - 3 = 0