Question

A number x divided by 3 is at most 5.

Answer 1

"At most" refers to less than or equal to (≤).
This is because "at most" means no more than, must be less than, and can be equal to.
As an inequality, this would be written as x / 3 ≤ 5.
This means that x divided by 3 is less than or equal to (at most) 5.