smaller integer = x larger integer = 3x+4 x + (3x+4) < 21 x + 3x + 4 < 21 4x + 4 < 21 4x < 17 x <x < 4.25 So the largest integer the smaller one can be is 4. In that case the larger one is 3(4)+4 = 12+4 = 16. x < 3x < 3x+4 < +4 3x+4 < 16.75 So the largest integer the larger one can be is 16. And it turns out, as we saw above, that this is when the smaller is 4. Edwin