[
  "To simplify a three-term ratio, find the HCF of all three numbers. Divide every term by the HCF.",
  "The HCF of 35, 25, and 15 is 5. 35 / 5 = 7, 25 / 5 = 5, 15 / 5 = 3.",
  "The simplest form is 7 : 5 : 3."
]