conversations.from: human
conversations.value: Find the answer to this math problem: Thomas, Toby, and Rebecca worked a total of 157 hours in one week.  Thomas worked x hours.  Toby worked 10 hours less than twice what Thomas worked, and Rebecca worked 8 hours less than Toby.  How many hours did Rebecca work?
conversations.from: assistant
conversations.value: Toby: 2x-10
  Rebecca: (2x-10)-8=2x-18
  Total:2x-10+2x-18+x=157
  5x-28=157
  5x=185
  x=37 hours
  Rebecca:2(37)-18=56 hours