conversations.from: human
conversations.value: Ursula bought five hot dogs at $1.50 each and three salads at $2.50 each. If she had two $10 bills, how much change did she get back?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: Five hotdogs cost 5 x $1.50 = $7.50.
  Three salads cost 3 x $2.50 = $7.50.
  The total cost was $7.50 + $7.50 = $15.
  And, Ursula had 2 x $10 = $20.
  Therefore, Ursula got a change of $20 - $15 = $5.