Răspuns :
a+b=2400
a-200=b+200
a=b+400
b+400+b=2400
2b=2400-400
b=2000:2
b=1000 l intr-o cisterna
a=1000+400=1400 l in a2a cisterna
a-200=b+200
a=b+400
b+400+b=2400
2b=2400-400
b=2000:2
b=1000 l intr-o cisterna
a=1000+400=1400 l in a2a cisterna