Răspuns:
___ __
abc : bc = 5 rest 4 <=>
(100a + 10b + c) : (10b+c) = 5 rest 4 <=>
100a + 10b + c = 5(10b+c) +4 <=>
100a + 10b + c = 50b+5c+4 <=>
100a = 50b-10b+5c-c+4 <=>
100a = 40b+4c+4 I:4 <=>
25a = 10b+c+1
a = 1 => 10b+c+1 = 25 => 10b+c = 24 => b = 2 ; c = 4
Numărul este 124
