Rub-a-Dub-Dub, They Were in a Tub
Puzzle 20 of Online Shopping Easy Pack
Question is: Rub-a-Dub-Dub, They Were in a Tub
and the answer is: THREEMEN
Word Meaning:
THREE — A numerical value after two and before four. Represented in Arabic digits as 3; this many dots (•••).
Definitions from Wiktionary.