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Arithmetic Aptitudes Area
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Explanation:
Let breadth = X. Then, length = 3X. Then, (3X - 9) (X + 9) = 3X * X + 81 ⇒3X2+27X-9X-81=3X2+81 18X=162 ⇒X=9 cm ∴ Length of the rectangle = 9 cm
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