# I'm thinking of a number

The unusual thing about this number is that the most common phrases that use it are wrong. That is, while someone may often say there are X As in a B, the actual number is not X.

What number am I thinking of?

Hint 1:

"There are X As in a B", but almost every B contains at least X + 2 As.

Hint 2:

"There are X Cs in a D" but a D always contains between X + 0.1 and X + 0.3 Cs

• It looks like the hints are necessary for the actual puzzle here. Otherwise I could just answer rot13(n pbhcyr, fvapr jura jr fnl "n pbhcyr guvatf" jr hfhnyyl qba'g zrna rknpgyl gjb). – EKons Apr 14 '19 at 18:40
• @EKons But rot13(n zneevrq pbhcyr) is correct. – Rupert Morrish Apr 14 '19 at 20:09

$$52$$
There are $$52$$ cards in a deck, but almost all standard decks are sold with an extra two or three jokers, as some card games need these.
It's said there are $$52$$ weeks in a year, but a year has 365 or 366 days and, $$365/7 \approx 52.14...$$ and $$366/7 \approx 52.28...$$