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120:2=60 / 160:2=80
60:2=30 / 80:2=40
30:2=15 / 40:2=20
15:3=5 / 20:2=10
5:5=1 / 10:2=5
5:5=1
MCD(120, 160)=2*3 x 5= 8 x 5=40