He took them to a pignic.
or
The question is irrelevant, since you couldn't find the dolls even if you knew how many. (Note: Well, this was a good joke in 1983-84. . . .)
or
Two. One to take notes while the other screws it into the faucet.
or
Four. One to change the bulb and three to whine "It's too high"
or