If in the word 'ADVANCE', all the vowels are replaced with the next letters and all the consonants are replaced with the previous letters from the English Alphabet. Now if all vowels are deleted how many consonants are remain there?

The correct option is Six.

Let's break down the solution step-by-step to find the remaining number of consonants after applying the given rules.

Step 1: Identify the letters in the word 'ADVANCE'.
The word is ADVANCE, which consists of the following 7 letters:
A, D, V, A, N, C, E

Step 2: Classify the letters into Vowels and Consonants.
• Vowels in the word: A, A, E
• Consonants in the word: D, V, N, C

Step 3: Apply the given replacements.
• Vowels are replaced by their next letter in the English alphabet:
- A → B
- A → B
- E → F

• Consonants are replaced by their previous letter in the English alphabet:
- D → C
- V → U
- N → M
- C → B

Step 4: Form the new word.
Replacing each letter in order:
- A becomes B
- D becomes C
- V becomes U
- A becomes B
- N becomes M
- C becomes B
- E becomes F

The newly formed letter sequence is: B C U B M B F

Step 5: Delete all vowels from the new sequence.
In the new sequence (B, C, U, B, M, B, F):
• 'U' is a vowel, so it is deleted.
• The remaining letters are: B, C, B, M, B, F

Step 6: Count the remaining consonants.
All remaining letters (B, C, B, M, B, F) are consonants.
Counting them:
1. B
2. C
3. B
4. M
5. B
6. F

There are a total of 6 consonants remaining.

Therefore, Six consonants remain after all the given steps.