{
  "problem": "The scale on a map is 4cm : 7km. If two cities are 40cm apart on the map, what is the actual distance in km between the two cities?",
  "hints": [
    "The scale means that every 4cm on the map corresponds to an actual distance of 7km.",
    "A distance of 40cm on the map is the same as 10",
    "$\\cdot$",
    "4cm.",
    "The actual distance between the two cities is 10 $\\cdot$ 7km, or 70km."
  ]
}
{'source': 'AMPS', 'file': 'amps/khan/451/1608068558.json'}