human
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?
assistant
How much time does the coloring take? ** The coloring takes 2*.3=<<2*.3=.6>>.6 hours less than the drawing
How much time does the coloring take? ** So it takes 2-.6=<<2-.6=1.4>>1.4 hours per picture
How much time does he spend on all the pictures? ** So it takes him 2+1.4=<<2+1.4=3.4>>3.4 hours per picture
How long does he spend on all the pictures? ** That means it takes 3.4*10=<<3.4*10=34>>34 hours
#### 34