conversations.from: human
conversations.value: Oliver has $40 and 200 quarters. If he gives his sister $5 and 120 quarters, how much money in total is he left with?
  How to solve this?
conversations.from: assistant
conversations.value: The 200 quarters equals 200*$0.25 = $50.
  Oliver has a total of $40+$50 = $90.
  He gives his sister 120*$0.25 = $30 in total from the quarters.
  The total amount he gave to his sister is $30+$5= $35.
  Oliver is left with $90-$35 = $55.