conversations.from: human
conversations.value: I'm completely lost with this math problem: John raises butterflies.  He has 4 jars of 10 caterpillars each.  40% of them fail to become butterflies, but the rest become caterpillars.    He sells the butterflies for $3 each.  How much money does he make?
  Can you give me a hand?
conversations.from: assistant
conversations.value: He has 4*10=40 caterpillars.
  40*.4=16 fail to form.
  That means he has 40-16=24 butterflies.
  So he makes 24*3=$72.