a)138-(5x3)=138-15=123 ani
b)notam T=tata M=mama B=bunicul
M=T-3
B=T+27
M+T+B=138
T-3+T+T+27=138
3T+30=138
3T=138-30
3T=108
T=108:3
T=36 ani
M=T -3
M=36-3
M=33 ani
B=T +27
B=36+33
B=69 ani
