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81 = 2.5x + 2.4x
81 = 10x + 8x
81 = 18x
x = 81/18
x = 4,5
jadi panjang = 5x = 5×4,5 = 22,5 m
lebar = 4x = 4×4,5 = 18 m
luas = panjang × lebar = 22,5 × 18 = 405 m²