Răspuns :
a.I____I____I____I____I____I
b.I____I ...............200............I
a-b=200
a=5b
5b-b=200
4b=200
b=200:4
b=50
a=5x50
a=250
Verificare : 250-50=200
b.I____I ...............200............I
a-b=200
a=5b
5b-b=200
4b=200
b=200:4
b=50
a=5x50
a=250
Verificare : 250-50=200