suma a+b=60
a:b=cat 2 rest 3 
nr?


Răspuns :

42-a
18-b ;
42+18=60, 42/18=2,(3)
a + b = 60
a : b = 2 rest 3
a = 2b + 3
2b + 3 + b = 60
3b = 57
b = 57 : 3
b = 19
a = 2 * 19 + 3
a = 41