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12x=120
x=10 cm
ab=10 x 3=30 cm
bc=10 x 4=40 cm
ac=10 x 5=50 cm
120 = 3x+4x+5x
120 =12x
10 =x
ab=3x=3(10)=30 cm
bc=4x=4(10)=40
ac=5x=5(10)=50