"Thirty, forty, fifty"
Translation:Тридцять, сорок, п'ятдесят
Etymological dictionaries discuss several possible sources of borrowing: Greek, Scandinavian and Turk. Some of these versions say that the word сорок originally meant a sack of fells (furs?) which contained 40 pieces of animal hides. And the sack name was either borrowed from another language or is relative to the word сорочка.