Let Breadth = x and Length = 4 x ∴ Original area = 4 x × x = 4 x² Now, New Area = ( 4 x +20 ) x (x +20) ∴ ( 4 x +20 ) × (x +20) - 4x² = 900 ⇒ 100x=900 – 400 ⇒ x= 5 ∴ l = 4 × 5 = 20cm
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