Verbal Reasoning - Mental Ability Questions

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

5 - 12 + 15 ÷ 50 x 25 = 23

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

MT : JW : : RP : ?

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

ZXVT : ACEG :: SQOM :?

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

Medicine : Patient : : Education : ?

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

Sound : Medium : : Light : ?

Select the related letters from the given alternatives.

BEH : KNQ :: FIL : ?

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

5 : 100 : : 6 : ?

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

GIKM: RTVX :: HJLN : ?