Răspuns :
a + b = 28
a : b = 4 rest 3
a = 4b + 3
4b + 3 + b = 28
5b = 28 - 3
5b = 25
b = 25 : 5
b = 5
a = 4 x 5 + 3 = 20 + 3 = 23
23 + 5 = 28
23 : 5 = 4 rest 3
a+b = 28
a : b = 4 r 3
a = 4b + 3
4b + b + 3 = 28
5b = 28 - 3
5b = 25
b = 25 : 5 = 5
a = 4 × 5 + 3 = 23
a : b = 4 r 3
a = 4b + 3
4b + b + 3 = 28
5b = 28 - 3
5b = 25
b = 25 : 5 = 5
a = 4 × 5 + 3 = 23