exam Maths Puzzle Numerical Ability

Lauren wants to mix 5 liters of 7% milk with skim- milk(0%fat) to produce a mixture of 2 46/47% milk. How much skim-milk should Lauren add?

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Can someone please help me solve this equation: √x-2 = 6√x^3-26. I would really appreciate it and thank you very much for taking the time to help me. A right pyramid has a square base that measures 10cm on each side. It's peak is 12cm above the center of it's base. What is the sum of the lengths of the pymramid's eight edges? Ex