Let's guess and check.
Let's try 8
2 × 8 = 16
3 × 8 = 24
4 × 8 = 32
16 + 24 + 32 = 72 ==> too high
Let's try 6,
2 × 6 = 12
3 × 6 = 18
4 × 6 = 24
12 + 18 + 24 = 54 ==> perfect
Wow, I did not think I'd get that on the 2nd try.
So the numbers are 12, 18, and 24.
