a + a + 2 + a + 4 = 12.000
3a + 6 = 12.000
3a = 12.000 – 6
3a = 11.994
a = 11.994/3
a = 3.998
a = 3998
Bilangan pertama = a = 3.998 (genap)
Bilangan kedua = a + 2 = 3.998 + 2 = 4.000 (genap)
Bilangan ketiga = a + 4 = 3.998 + 4 = 4.002 (genap)