human
A bag of buttons had 21 buttons in it. Seven buttons had two holes and the rest had four holes. How many holes were in all the buttons in the bag?
assistant
How many buttons had four holes? ** There were 21 - 7 = <<21-7=14>>14 buttons with four holes.
How many holes did the four-holed buttons have? ** The four-holed buttons had 14 * 4 = <<14*4=56>>56 holes.
How many holes did the two-holed buttons have? ** The two-holed buttons had 7 * 2 = <<7*2=14>>14 holes.
How many holes were in all the buttons in the bag? ** Thus, there were 56 + 14 = <<56+14=70>>70 holes in all the buttons in the bag.
#### 70