If the first three letters of the word 'COMPREHENSION' are reversed, then the last three letters are added to it, and then the remaining middle letters are reversed and added at the end, which letter will be exactly in the middle of the newly formed sequence?

In the word 'CONFIDANTS', each consonant is replaced with the next letter in the alphabetical series, and each vowel is replaced by its previous letter in the alphabetical series. After performing these changes, how many vowels are present in the newly formed word?

A 9-digit number is written as: 729148536. If the digits of the number are rearranged in ascending order from left to right, how many digits remain in the same position as in the original arrangement?