Answer: One doll can be finished with 5 buttons.
Step to step explanation:-
Given statements : A machine makes 5 buttons at a particular time.
The number of buttons each doll shirt gets= 5
Therefore, the number of dolls finished with 5 buttons= 1
Therefore, if a machine makes 5 buttons at a particular time and each doll shirt gets 5 buttons then only one doll can be finished with 5 buttons.