exam Maths Puzzle Numerical Ability

7-2n=n-14

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exam Other Question

Julie stone designed a rectangular patio that is 25 ft by 40 ft. This patio is surrounded by a terraced strip of uniform width planted with small trees and shrubs. if the area A of this terraced strip is 504 ft^2, find the width of x of the strip. [0 1 -2][1 -3 0]
[5 3 -4]x[2 0 -1]
[-1 0 0] [0 1 -2]