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bil.kedua = ×
bil.ketiga = × + 2
jumlah = 90
bil.pertama + bil.kedua + bil.ketiga = 90
(× - 2) + × + (× + 2) = 90
3× = 90
× = 30
jadi,
bil.pertama = x - 2 = 30 - 2 = 28
bil.kedua = × = 30
bil.ketiga = × + 2 = 30 + 2 = 32
urutannya : 28, 30, 32
3x = 84
x = 28
bilangan tsb adalah 28, 30, 32