conversations.from: human
conversations.value: How much does it cost you for lunch today at Subway if you pay $40 for a foot-long fish sub and thrice as much for a six-inch cold-cut combo sub?
  Solve this problem.
conversations.from: assistant
conversations.value: If you pay $40 for a foot-long fish sub, thrice as much for a six-inch cold-cut combo sub will be 3*$40= $120
  The cost of lunch will be $120+$40 = $160