conversations.from: human
conversations.value: Lloyd earns $10 an hour on Math tutoring.  He tutored 5 hours for the first week and 8 hours for the second week. How much did he earn for the first two weeks?
conversations.from: assistant
conversations.value: Lloyd tutored 5 + 8 = 13 hours for the first two weeks.
  Therefore, he earned 13 x $10 = $130 for the first two weeks.