Verbal Reasoning - Mental Ability Questions

It means that the first half of the alphabet is interchanged with second half of the alphabet. After making changes, nth letter from the left will be (n + 13)th letter of original series, ie English alphabet; If n is less than 14. But if n is more than 13, nth letter from left will be (n - 13)th letter from left.
In the given equation, we have to find out (13 - 7 =) 6th letter from right => (26 - 6 + 1 =) 21st letter from the left. Hence, required letter's position is more than 13; therefore the required letter is (21 - 13 =) 8th letter from left of original series, ie H.

Letters of the word PREMONITION are coded as follows:

Letters :  P    R    E    M    O    N    I    T    I    O    N

Code:        6    8    5    3    0    4    9    2    9    0    4

See the code below Is and Ns. Codes for I and N are 9 and 4 respectively. This indicates that the digits below each letters represent its code. Therefore, code for the word MONITOR is 3049208

The man's brother's father means his father is the only son of woman's grandfather

=> grandfather to the man also

=> Woman and the man are brother and sisters.

Alluvial soils comprising of silt and sand carried down by the rivers, are very fertile. However, cotton is grown in black soil that suits its mineral requirements 

There are 10 digits. Now, third digit from the right means (10-3+1 = ) 8th digit from the left.  But, from the question , third  and eighth digits are interchanged. Hence, the required digit is the third digit of the given number, ie 0.

First causes the second. Here Race causes Fatigue and similarly, Fast causes Hunger.

Hence, Race : Fatigue :: Fast : Hunger.