Răspuns :
a+b=72
a:b=2 r 15 --> a=2b+15
2b+15 + b = 72 --> 3b + 15 = 72 3b= 72-15 3b=57
b= 57:3
b= 19
a= 2b + 15
a= 38 + 15
a= 53
a:b=2 r 15 --> a=2b+15
2b+15 + b = 72 --> 3b + 15 = 72 3b= 72-15 3b=57
b= 57:3
b= 19
a= 2b + 15
a= 38 + 15
a= 53