The quotient of 16 and b is at most 4?

Answer 1

16/b .LE. 4 {the .LE. means less than or equal to, I think it's from FORTRAN, but cannot recall for sure off hand}

So 16/b .LE. 4 --> multiply by b: 16 .LE. 4*b --> divide by 4: 4 .LE. b, so: b is greater than or equal to 4