conversations.from: human
conversations.value: Solve the math problem: Hally and her friends organized a high school reunion. To cover the cost of a late-night party that they planned for at the reunion, each attendee had to pay $100. After the party, Hally and her friends realized that the total expenses were $500 less than the total contributions. If there were 50 people at the party, how much money was used to pay for the party expenses?
conversations.from: assistant
conversations.value: The total planned cost for the party was 100*50 = $5000
  The total expenses for the party are 5000-500 = $4500