book Maths Puzzle Numerical Ability

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(e^3x+1)^2/e^4=e^10x

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I need to find the greatest common factor. 12a^3b^2,18a^2b^3,6a^4b^4 2.5 44) Geometry.

The lenght of a recetangular playing field is 5 feet less than twice its width. If the perimeter of the playing dield is 230 ft, find the lenght and width of the field.