book Maths Puzzle Numerical Ability

3=7(h-2)+17 i dont understand how to do this

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An advertisement for a pineapple drink claims that the drinkcontains 15% pineapple juice. How much pure pineapple juice would have to be added to 8 quarts of the drink to obtain a mixture containing 50% pineapple juice? Find the roots of the quadratic equations using the quadratic formula. Express the roots, if they are not rational, in simplest radicl form.

4x^2 - 12x - 7 = 0