144, 288, 432
16, 32, 48
48, 96 and 144
8 16 24
400, 800, 1200
They are: 144, 288 and 432
8, 16, 24
144, 288, 432
48, 96, 144
32, 64, 96
80, 160, 240
16, 32, 48. Since 16 is divisible by 4. Every multiple of 16 is also a multiple of 4, so I just took the first 3 multiples of 16.
For 16 and 20, 80,160,240 For 30 and 33, 330,660,990