The smallest number is 28

3 consecutive even numbers : x, x + 2, x + 4 x + x + 2 + x + 4 = 90 3x + 6 = 90 3x = 90 - 6 3x = 84 x = 84/3 x = 28 <== smallest one x + 2 = 28 + 2 = 30 x + 4 = 28 + 4 = 32