[
  "Combine the two ratios by finding a common basis for the total of Han Boon and Richard.",
  "HB + R total = 5 units. Andy : (HB+R) = 1 : 3 = 5 : 15 (multiply by 5 so HB+R = 15). HB : R = 4 : 1 = 12 : 3 (multiply by 3 to get HB+R = 15).",
  "Andy : Han Boon : Richard = 5 : 12 : 3."
]