exam Maths Puzzle Numerical Ability

How many liters of pure water (o% salt) must be added to 5 liters of an 85% salt solution to dilute it so a 68% salt solution?

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I'm having trouble dividing this please help. Divide 3x^4-x^3+x+1 / 2x^2+x+1 If you have a square that is 6ft by 6ft and want to make it a triangle with the same square footage, what would it be and how?