Răspuns :
a+b+c=907
a+b=394
b+c=394x2=788
c=907-394=513
b=788-513=275
a=394-275=119
a+b+c=907
a+b=394
b+c=394x2=>b+c=788
inlocuim a+b
394+c=907
c=907-394=513
inlocuim b+c
a+788=907
a=907-788=119
b=788-513=275
verificare 119+275+513=907
a+b=394
b+c=394x2=>b+c=788
inlocuim a+b
394+c=907
c=907-394=513
inlocuim b+c
a+788=907
a=907-788=119
b=788-513=275
verificare 119+275+513=907