Verbal Reasoning - Mental Ability Questions

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

8,21,60,177,?

In the following question, select the related letters from the given alternatives.
AGN : IOV : : BLM : ?

If "*" denotes "added to", "&" denotes "divided by", "@" denotes "multiplied by" and "%" denotes "subtracted from", then 136 & 8 @ 7 % 3 * 7 = ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
PON, LKJ, GFE, ?

In the following question, select the related number from the given alternatives.
ACOUSTIC : 91 : : RENOUNCE : ?

If "A" denotes "added to", "C" denotes "divided by", "D" denotes "multiplied by" and "B" denotes "subtracted from", then
81 C 9 D 11 B 4 A 6 = ?

In the following question, correct the equation by interchanging two signs.
4 – 10 x 5 + 9 ÷ 3 = 51

A is taller than B, who is shorter than C, but taller than D. Who is the shortest?