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panjang = p
tinggi = 2 m = 200 cm
lebar = volum / (panjangxtinggi)
= 720.000 / 200p
= 3600/p cm
V = 720 dm^3 = 720.000 cm³
t = 2 m = 200 cm
V = l^2 × t
720.000 cm³= l^2 × 200 cm
l^2 = 720.000 / 200
l^2 = 3600
l = √3600
l = 60 cm
Jadi lebar lemari tersebut adalah 60 cm