Răspuns :
a+b=640
a=3/5b
3/5b+b=640 amplificam cu 5
3b+5b=3200
b=3200:8
b=400
a=640-400=240
a=3/5b
3/5b+b=640 amplificam cu 5
3b+5b=3200
b=3200:8
b=400
a=640-400=240
a+b=640
a=3/5b
3/5b+b=640 amplificam cu 5
3b+5b=3200
b=3200:8
b=400
a=640-400=240
a=3/5b
3/5b+b=640 amplificam cu 5
3b+5b=3200
b=3200:8
b=400
a=640-400=240