conversations.from: human
conversations.value: John is performing in 3 plays.  Each play has 5 Acts.  He wears 2 wigs per act.  Each wig cost $5.  He drops one of the plays and sells all of the wigs for that play for $4.  How much money did he spend?
conversations.from: assistant
conversations.value: He used 5*2=10 wigs per play
  So in total, he used 10*3=30 wigs
  They cost 30*5=$150
  He gets back 10*4=$40 from selling the wigs
  So he spent 150-40=$110