conversations.from: human
conversations.value: I would love to understand how to solve this problem: Keiko sent 111 text messages last week. This week she sent 50 less than double what she sent last week. How many text messages did Keiko send last week and this week combined?
  Can you explain?
conversations.from: assistant
conversations.value: Last week = 111 texts
  This week = (2 * 111) - 50 = 172 texts
  111 + 172 = 283 texts
  Keiko sent 283 texts last week and this week combined.