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Verified answer
L = 20 . (6y - 1)= (120y - 20) m²
L > 100
120y - 20 = 100
120y = 100 + 20
120y = 120
y = 1
L = 120 . 1 - 20
= 121 - 20
= 101 m²
Lebar minimal = 101/20 = 5,05 m