Verbal Reasoning - Mental Ability Questions

Select the missing letter from the given responses?

Select the related word/letters/number from the given alternatives.
25: 260 : : 30 : ?

Select the related word from the given alternatives.
River : Stream :: Ocean : ?

Select the related letters from the given alternatives.
WVT : SRP :: MLJ : ?

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

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

SAY, TDD, UGI, VJN, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
I, V, ? , L

A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.

bat, thin, reply, length, ?