bantu jawab ya!! no 19 aj

p : l = 7 : 5 <=> p = 7x ; l = 5x
2(p+l) = 120 m
p+l = 60 m
7x + 5x = 60 m
12x = 60 m
x = 5 m

p = 7x = 7(5 m) = 35 m
l = 5x = 5(5 m) = 25 m

L=pl=35 m×25 m = 875 m² (A.)

*Semoga membantu, jawaban terbaiknya ditunggu :v*

Misalkan dengan x
Panjang = 7x
Lebar = 5x
Keliling = 2(panjang) + 2(lebar)
            = 2(7x) + 2(5x) = 120m
120m = 14x + 10x
120m = 24x
x = 120/24 = 5
Panjang = 7(5) = 35m
Lebar = 5(5) = 25m
Luas = Panjang x lebar = 35 x 25 = 875m2