conversations.from: human
conversations.value: Solve the following math problem: Karen has 32 quarters in her piggy bank.  Her older brother Christopher has 64 quarters in his piggy bank.  How much more money does Christopher have?
conversations.from: assistant
conversations.value: Christopher has 64 quarters so he has 64*.25 = $16.00
  Karen has 32 quarters so she has 32*.25 = $8.00
  If Christopher has $16.00 and Karen has $8.00 then Christopher has 16-8 = $8.00 more than Karen