In the word **ENVIRONMENT**, if all the consonants are replaced with their immediate previous letter and all the vowels are replaced with their immediate next letter according to the alphabetical series, then how many vowels are there in the new word formed after the rearrangement?

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**Solution:**

1. Identify vowels and consonants in the word **ENVIRONMENT**.
   - Vowels: E, I, O
   - Consonants: N, V, R, N, M, N, T

2. Replace each vowel with the immediate next letter in the alphabetical series:
   - E → F
   - I → J
   - O → P

3. Replace each consonant with the immediate previous letter in the alphabetical series:
   - N → M
   - V → U
   - R → Q
   - M → L
   - T → S

4. Substitute these in the original word:
   - E N V I R O N M E N T
   - F M U J Q P M L F M S

5. Count the vowels in the new word:
   - Letters: F, M, U, J, Q, P, M, L, F, M, S
   - Vowels here are only **U**

**Answer:** One

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