conversations.from: human
conversations.value: Solve the math problem: John decides to take up illustration.  He draws and colors 10 pictures.  It takes him 2 hours to draw each picture and 30% less time to color each picture.  How long does he spend on all the pictures?
conversations.from: assistant
conversations.value: The coloring takes 2*.3=.6 hours less than the drawing
  So it takes 2-.6=1.4 hours per picture
  So it takes him 2+1.4=3.4 hours per picture
  That means it takes 3.4*10=34 hours