If 6 @ 4 @ 7 = 101 and 2 @ 5 @ 11 = 150, then what is the value of A in A @ 8 @ 9 = 289?

How many such pairs of letters are there in the word ENCOURAGEMENT which have as many letters between them as there are between them in the English alphabet?

In each of the following questions, five words are given. Which of them will come in the middle if all of them are arranged alphabetically as in a dictionary?

Number of letters skipped in between  adjacent letters in the series is in the order of 2 , 5 , 7 , 10 

If 1+4=9, 2+8=18, 3+6=15 then the value of 7+8=?

Arrange the following words in a meaningful order.

1. Red Fort

2. World

3. Delhi

4. India

5. Universe

The number of letters skipped in between adjacent letters in the series is odd.  

Arrange the following words according to the dictionary order
1. Approach
2. Appropriate
3. Approval
4. Approve