Răspuns :
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
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