Let's say the number is x.
We want the difference between three times the number and 16.
We can write that expression as 3x-16.
This must be at least 8, so
3x-16≥8 is the inequality.
Now we need to solve this inequality for the number, x.
3x-16≥8
add 16 to both sides
3x ≥ 24
divide both sides by 3
x ≥ 8