exam Maths Puzzle Numerical Ability

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5xy + 2z if x = -3, y = 2 and z = -5

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A dress was first marked down 20% off original price. Then marked down 25
% more off the first sale price and finally 30% off the second sale price. It was sold for 63$ What was the original price? There is no textbook the teacher made it up. The length of a rectangle is 2in. more than twice it's width. If the perimeter of the rectangle is 52in., find the width of the rectangle.