human
Ellen is baking bread. It takes 3 hours to rise 1 ball of dough, and then another 2 hours to bake it. If she makes 4 balls of dough one after another and then bakes them one after another when they're done rising, how many hours will it take?
assistant
How many hours does it take to rise all balls of dough? ** Ellen takes 4*3=<<4*3=12>>12 hours in total to rise all balls of dough.
How many hours does it take to bake each one? ** It will take 4*2=<<4*2=8>>8 more hours to bake each one.
How many hours will it take to make all of the bread? ** It will take her 12+8=<<12+8=20>>20 hours to make all of the bread.
#### 20