Răspuns :
m=a+21, m+10=2a, inlocuim m in a doua relatie, a+21+10=2a, a=11 ani are Anca,
m=11+21=32 ani are mama
A= m-21
m=A+21
10+ m=2A
m=2A-10
A=2A-10-21
10+21=2A-A
31=A
m=31+21=52
Răspuns:Anca=31 ani
mama=52 ani
m=a+21, m+10=2a, inlocuim m in a doua relatie, a+21+10=2a, a=11 ani are Anca,
m=11+21=32 ani are mama
A= m-21
m=A+21
10+ m=2A
m=2A-10
A=2A-10-21
10+21=2A-A
31=A
m=31+21=52
Răspuns:Anca=31 ani
mama=52 ani