Question

The quotient of a number and 3 is at least 5 and no more than 12

Answer 1

x / 3 ≥ 5
x / 3 < 12

15 / 3 = 5
18 / 3 = 6
21 / 3 = 7
...
33 / 3 = 11

x is any multiple of 3 between 15 and 33, inclusive.