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2.5x + 2.4x = 81
10x + 8x = 81
18x = 81
x = 81 / 15
x = 4,5
p = 5. 4,5 = 22,5
l = 4. 4,5 = 18
Luas = pl
= 22,5 . 18
= 405 cm2
L = 4/(4+5) dikali 81 : 2 = 18m
luas = p dikali lebar
= 22, 5 dikali 18m
= 405 m