Răspuns :
a/2 :b/2=2 rest 15
a/2=b/2×2+15
a/2=b+15
a=2b+30
a-b=140
2b+30-b=140
b+30=140
b=140-30
b=110
a=2×110+30
a=250
2a=2×250
2a=500
a/2=b/2×2+15
a/2=b+15
a=2b+30
a-b=140
2b+30-b=140
b+30=140
b=140-30
b=110
a=2×110+30
a=250
2a=2×250
2a=500