exam Maths Puzzle Numerical Ability

How many gallons of a 40% solution must be mixed with 96 gallons of 60% solution to obtain a 52% solution?

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exam Other Question

The length of a rectangle is two feet more than three times the width. Express as an integer the maximum width of the rectangle when the perimeter is less than twenty-eight feet. y=(x-3)(x-5)(x-a), solve for a?