conversations.from: human
conversations.value: Solve the math problem: Mary and Rose went shopping to buy presents. They spent the same amount. Mary bought two pairs of sunglasses for $50 each and a pair of jeans for $100.  Rose bought a pair of shoes at $150 and two decks of basketball cards. How much did one deck of basketball cards cost?
conversations.from: assistant
conversations.value: Two pairs of sunglasses costs 2 x $50 = $100.
  So, Mary spent $100 + $100 = $200.
  Thus, two decks of basketball cards costs $200 - $150 = $50.
  Therefore, one deck of basketball cards costs $50/2 = $25.