conversations.from: human
conversations.value: I need help with this problem:
  Shelly has ten $10 bills and four fewer $5 bills. How much money does Shelly have in all?
conversations.from: assistant
conversations.value: Shelly's ten $10 bills amount to 10 x $10 = $100.
  She has 10 - 4 = 6 $5 bills.
  The 6 $5 bills amount to 6 x $5 = $30.
  Thus, Shelly has $100 + $30 = $130 in all.