exam Maths Puzzle Numerical Ability

How many liters each of a 2% salt solution and an 10% salt solution must be combined to produce 30 liters of a 4% salt solution?

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Find the slope of the line passing through the points (-4, 0) and (-4, -2). Can you please help me solve: A 5 in. by 7 in. photograph is surrounded by a frame of uniform width. The area of the frame equals the area of the photograph. Find the width of the frame.