Răspuns :
a + b = 75
a : b = 5 rest 3
a = 5b + 3
5b + 3 + b = 75
6b = 75 - 3
6b = 72
b = 72 : 6
b = 12
a = 75 - 12
a = 63
sau
a __/__/__/__/__/ + 3
b __/
75 - 3 = 72
72 : 6 = 12
b = 12
a = 75 - 12
a = 63
a : b = 5 rest 3
a = 5b + 3
5b + 3 + b = 75
6b = 75 - 3
6b = 72
b = 72 : 6
b = 12
a = 75 - 12
a = 63
sau
a __/__/__/__/__/ + 3
b __/
75 - 3 = 72
72 : 6 = 12
b = 12
a = 75 - 12
a = 63