conversations.from: human
conversations.value: James hires a seamstress to fix all his shirts and pants.  He has 10 shirts and 12 pairs of pants.  It takes 1.5 hours to fix a shirt and twice as long for pants.  The tailor charges $30 per hour.  How much does it cost?
  Solve this problem.
conversations.from: assistant
conversations.value: It takes 10*1.5=15 hours to fix his shirts
  It takes 1.5*2=3 hours per pair of pants
  So it takes 3*12=36 hours for the pants
  That means in total it takes 15+36=51 hours
  So it cost 51*30=$1530 to fix everything