If in the word **MALNOURISHED**, all the vowels are replaced with the succeeding letters in the English alphabet and all the consonants are replaced with the preceding letters, and then all the letters are arranged in reverse alphabetical order from the left end, how many letters are there between the fourth letter from the right end and the third letter from the left end according to the English alphabetical order?

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**Solution:**

1. Identify vowels and consonants in the word **MALNOURISHED**:
   - Vowels: A, O, U, I, E
   - Consonants: M, L, N, R, S, H, D

2. Replace vowels with their succeeding letters:
   - A → B
   - O → P
   - U → V
   - I → J
   - E → F

3. Replace consonants with their preceding letters:
   - M → L
   - L → K
   - N → M
   - R → Q
   - S → R
   - H → G
   - D → C

4. Substitute all letters in the word:
   - M A L N O U R I S H E D
   - L B K M P V Q J R G F C

5. Arrange these letters in **reverse alphabetical order** (from left to right):
   - The letters are: L, B, K, M, P, V, Q, J, R, G, F, C
   - Alphabetical order: B, C, F, G, J, K, L, M, P, Q, R, V
   - Reverse alphabetical order: V, R, Q, P, M, L, K, J, G, F, C, B

6. Now, find the letters at the specified positions:
   - Fourth letter from the right end:
     - Right end letters: B (1st), C (2nd), F (3rd), G (4th)
     - So, the fourth letter from right end is **G**

- Third letter from the left end:
     - Left end letters: V (1st), R (2nd), Q (3rd)
     - So, the third letter from left end is **Q**

7. Find how many letters are between **G** and **Q** in the English alphabetical order:
   - Alphabetical positions:
     - G = 7
     - Q = 17

- Letters between G and Q are those with positions 8 to 16:
     - H(8), I(9), J(10), K(11), L(12), M(13), N(14), O(15), P(16)

- Number of letters between = 16 - 8 + 1 = 9 letters

However, the question asks for how many letters are **between** them, so exclude G and Q themselves:
   - Letters strictly between = 17 - 7 - 1 = 9

**Answer:** Nine

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