Răspuns :
a+b+c=99
a+b=67
b+c=58
a+58=99. deci a=99-58=41
a+41=67, deci b=67-41=26
26+c=58, deci c=58-26=32
verificare: 41+26+32=99
a+b+c=99
a+b=67
b+c=58
a+58=99. deci a=99-58=41
a+41=67, deci b=67-41=26
26+c=58, deci c=58-26=32
verificare: 41+26+32=99