(a + b)/2 = 30 => a + b = 60
a : b = 5 rest 6 => a = 5b + 6
inlocuim in prima si obtinem 5b + 6 + b = 60 => 6b = 54 => b = 9 => a = 51
Verificare:
(9 + 51)/2 = 30
60/2 = 30
30 = 30 Adevarat
a : b = 5 rest 6
51 : 9 = 5 rest 6 ( 9 * 5 = 45, 51 - 45 = 6)