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b=20cm
c=25cm
a'=60cm
a'/a=k=60/15=4
k=4
b'=b*k=20*4=80cm
c'=c*k=25*4=100cm
b=20 n'=4*n
c=25
a'=4*a a'=4*15=60
b'=4*b b'=4*20=80
c'=4*c c'=4*25=100