Răspuns :
a+b+c=113
a+b=90
c=a:2
113=90+c
c=113-90
c=23
a=2*23=46
b=113-(46+23)
b=113-69
b=44
Verificare:46+44+23=113
a+b=90
c=a:2
113=90+c
c=113-90
c=23
a=2*23=46
b=113-(46+23)
b=113-69
b=44
Verificare:46+44+23=113