Reasoning Ability on Data Sufficiency for Bank Exam Question AND Answer

1.What is Suman's rank from the top in a class of forty students?
Statement:
a. Suman is 3 ranks below Deepak from the top.
b.Deepak;s rank from the bottom is 23.
c.Suman is 3 ranks above Deepak from the bottom.
[1]Any one of three
[2]Only a and b
[3]Only b and c
[4]All a, b and c
[5]Only b and either a or c
2.Who among Siddhartha,Vipin, Nikil and Mukul is the youngest?
Statement;
(a)Vipin is youngest than Mukul but older than Siddhartha and  Nikil
(b)Mukul is the oldest
(c)Siddhartha is the older than Nikil.
[1]Only (a)
[2]Only (a) and (b)
[3]Only (b) and (c)
[4]Only (a) and (c)
[5]None of these
3.How is 'DATE' written in the code language?
Statement;
(a)DEAR is written as $ # @ ? in that code.
(b)TREAT is written as %?#@% in that code.
(C)TEAR is written as % # @ ?in that code.
[1]Only (a) and (b)
[2]Only (b) and (c)
[3]All (a), (b) and (c)
[4]Only (a) and either (b) or (c)
[5]None of these


Answer
1.[5] From b, We conciude that in a class of 40, Deepak ranks 23rd from the bottom i.e.,18th from the top
From (a) and (b), We find that suman is 3 ranks below  18th from the top i.e.,  Suman ranks 21st from the top
From (b) and (c), We find that suman is 3 ranks above  23rd from thebottomi.e.,  Suman ranks 20th from the bottom or  21st from the top
2.[4] From (a) We have ;M>V,V>S,V>N......[1]
       From (b) We have ;Mukul is the oldest..[2]
         From (c) We have ; S>N....................[3]
combining [1] and [3] we get M>V>S>N   So,Nikil is the youngest.
3.[4]
  From (a) We have  the code for D is $ and the code for A is @
From (b) or (c)We have the code for T is % and E is #