Verbal Reasoning - Mental Ability Questions

In the following question, select the related number from the given alternatives.

9 : 81 : : 8 : ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

10 ÷ 18 + 25 x 20 - 5 = 92

If 18$2 = 10, 8$4 = 6 and 12$18 = 15, then find the value of 7$9 = ?

In the following question, select the related letter/letters from the given alternatives.

DFG : EGH : : PRS : ?

In the following question, select the related letter/letters from the given alternatives.

LJK : IGH : : PST : ?

In the following question, select the related letter/letters from the given alternatives.

VOT : SLQ : : HRX  :  ?

In the following question, select the related letter/letters from the given alternatives.

SRM : IHC : : ZUQ : ?

In the following question, select the related number from the given alternatives.

16 : 23 : : 22 : ?