Verbal Reasoning - Mental Ability Questions

Choose the related word/letters/number from the given alternatives.
NPR : GHI : : TVX : ?

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.
 
15 x 4 ÷ 35 - 70 + 16 = ?

Select the related word/letters/number from the given alternatives.
MUMBAI: UMBMIA :: GURUGRAM : ?

Choose the related word/letters/number from the given alternatives.
Nest : Bird : : Den : ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
VWX, BCD, HIJ, ?

Ryaan is Vehaan's mother's sister's father's only son's son. How is Ryaan related to Vehaan?

If 29$14 = 6, 37$25 = 3 then what is the value of 84$62 = ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. TP, UQ, WS, ZV, ?