[
  "To simplify a three-term ratio, find the HCF of all three numbers. Divide every term by the HCF.",
  "The HCF of 3, 6, and 18 is 3. 3 / 3 = 1, 6 / 3 = 2, 18 / 3 = 6.",
  "The simplest form is 1 : 2 : 6."
]