book Maths Puzzle Numerical Ability

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A 40% saline solution is to be mixed with a 60% saline solution to obtain 8 Liters of a 55% saline solution. How many liters of 40%

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What is the length of Arc XY if Q is the center and angle XQY is 60 degrees. The diameter is 8 degrees. You dont have to give me the answer but if you could explain how to figure out these types of problems it would help alot. Thank-you. How would I solve the inequality for the equation x - 1/x^2 < 0? I came up with the answer of (0,1). Would this be the correct answer or show me how to work for the correct answer.