Răspuns :
a+b+c=798
a+b=400
b+c=498
400+c=798
c=798-400
c=398
b+398=498
b=498-398
b=100
a+100=400
a=400-100
a=300
300+100+398=798
a+b=400
b+c=498
400+c=798
c=798-400
c=398
b+398=498
b=498-398
b=100
a+100=400
a=400-100
a=300
300+100+398=798
798-400=398 ( al treilea sac)
498-398= 100 ( in al doilea sac)
400-100= 300 ( in primul sac)
verificare: 398+300+100= 798
498-398= 100 ( in al doilea sac)
400-100= 300 ( in primul sac)
verificare: 398+300+100= 798