Verbal Reasoning - Mental Ability Questions

In the following question, select the missing number from the given series.

42, 21, 21, ?, 63, 157.5

What is the value of a two–digit number?

A. The sum of the digits is 15.
B. The difference of the squares of the digits is 45.
C. The difference of their digits is 3.

Consider the following information and answer questions based on it.

Six students Lily, Mary, July, Daisy, Rosy and Fairy are sitting in a circle facing each other such that -

1. Mary sits to the immediate right of July.

2. Lily does not sit near Fairy.

3. The student sitting on the immediate left of July, sits to the immediate right of Fairy.

4. Rosy does not sit to the immediate right of Mary.

If July leaves the circle, then who will be sitting to the immediate right of Lily?

Select the related word/letters/number from the given alternatives.

FG : UT : : HI : ?

Select the related word/letters/number from the given alternatives.

23 : 6 : : 43 : ?

Select the related word/letters/number from the given alternatives.

EFG : OPQ : : ? : STU

Select the related word/letters/numbers from the given alternatives:

Air:Bird::Water:

Select the related number from the given alternatives.

111 : 37 :: 123 : ?