In each of these sentences, can you replace the missing number.
The number is written as a word (e.g. five, twenty-four, thirty-three), and each sentence is correct after the replacement.
This sentence contains {?} X.
Slightly trickier, this sentence contains {?} R's.
Even trickier, this sentence contains precisely {?} E's.
This sentence has exactly {?} letters.
This sentence, hopefully, contains {?} letters, one hyphen, five commas, and four Y's.
To finish, if this sentence had a T removed, it would contain {?} letters!