book Maths Puzzle Numerical Ability

This is the question: A chemist wants to mix 46% and 56% alcohol solutions to make 40 liters of 47% alcohol solution. How many liters of 46% alcohol solution is necessary?(Please Help)

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Suppose that a ball is dropped from a height of 30ft and that each bounce reaches to 3/8 of the previous height. How high will the ball bounce on the second bounce? what is the formual for the area of a triangle?