Verbal Reasoning - Mental Ability Questions

In the following question, select the odd letters from the given alternatives.

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
400, -200, 100, ? , 25, -12.5

Find the missing number from the given alternatives.

Select the related word/letters/number from the given alternatives.
DI : M : : CR : ?

'Car' is related to 'Garage' in the same way as 'Hen' is related to ___.

If "S" denotes "multiplied by", "V" denotes "subtracted from", "M" denotes "added to" and "L" denotes "divided by", then 7 V 42 M 56 L 8 S 5 = ?

In the following question, select the related word from the given alternatives.
Sheep : Lamb : : Cow : ?

If 19#13=3; 25#3=11; 36#10=13; then what is the value of 7#3=?