原來茶位要收20一位
The teahouse was supposed to be 20 people.

Cantonese Sentence Breakdown

原來 yun4 loi4
originally
茶位 caa4 wai6
tea fee
要收 yiu1 sau1
want to collect
jat1
one
single
a (article)
as soon as
entire
whole
all
throughout
"one" radical in Chinese characters (Kangxi radical 1)
also pr. [yāo] for greater clarity when spelling out numbers digit by digit
first (positional)
one part of a fraction, such as 'a' quarter, an eighth
a short duration (when used with a verb)
each
same
dedicated
from the start
wai6
position
location
place
seat
classifier for people (honorific)
classifier for binary bits (e.g. 十六位 16-bit or 2 bytes)
throne
post
rank
status