Răspuns :
a - b = 286
a : b = 15 rest 6
a = 15b + 6
15b + 6 - b = 286
14b = 280
b = 280 : 14
b = 20
a = 286 + 20
a = 306
a : b = 15 rest 6
a = 15b + 6
15b + 6 - b = 286
14b = 280
b = 280 : 14
b = 20
a = 286 + 20
a = 306