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5 : 3 = p : l
p = 5/8 x 64 = 40 ( panjang total)
l = 3/8 x 64 = 24 ( lebar total )
luas = 20 x 12 = 240 cm²
64:8 = 8cm
panjang = 5×8 =40cm
lebar =3×8=24cm