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71. If α means 'greater than', β means 'less than', γ means 'not greater than', σ means 'not less than' and θ means 'equal to'
If 3C σ 2A and B α C, then

  A.  2A α 3B
  B.  3B α 2A
  C.  B θ A
  D.  3B θ 2A
     
   
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72. If α means 'greater than', β means 'less than', γ means 'not greater than', σ means 'not less than' and θ means 'equal to'
If 3B θ 2C and 2A α 3C, then

  A.  B σ A
  B.  B θ A
  C.  B β A
  D.  B α A
     
   
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73. If α means 'equal to', β means 'greater than', γ means 'less than' and σ means 'not equal to'
If 6x α 5y and 2y β 3z,then
  A.  2x β3z
  B.  4x β 3z
  C.  2x γ z
  D.  4x α 3z
     
   
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74. If α means 'equal to', β means 'greater than', γ means 'less than' and σ means 'not equal to'
If ax γ by, bx α cz and b2 α ac, then

  A.  ax β cy
  B.  ay α cz
  C.  y γ z
  D.  y β z
     
   
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75. If α means 'equal to', β means 'greater than', γ means 'less than' and σ means 'not equal to'
If abxy α c2z, bx β ay and b2 α ac, then

  A.  ax2 β cz
  B.  a2x2 β cz
  C.  b2x β c2z
  D.  bx2 β c2z
     
   
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76. If α means 'equal to', β means 'greater than', γ means 'less than' and σ means 'not equal to'
If bcy γ ax, cy α bz and a2 γ bc, then

  A.  cx αabz
  B.  cx γabz
  C.  cx σ abz
  D.  c2x γ a2z
     
   
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77. If α means 'equal to', β means 'greater than', γ means 'less than' and σ means 'not equal to'
If a2x α byz, czx α b2y and c2z α axy, then

  A.  abc α xyz
  B.  abc β xyz
  C.  abc σ xyz
  D.  abc γ xyz
     
   
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78. If A + B > C + D, B + E =2C and C + D > B + E, it neccessary follows that :
  A.  A + B > 2C
  B.  A + B >2D
  C.  A + B > 2E
  D.  A > C
     
   
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79. If A + D > C + E, C + D = 2B and B + E > C + D, it necessarily follows that

  A.  A + B > 2D
  B.  B + D > C + E
  C.  A + D > B + E
  D.  A + D > B + C
     
   
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80. In this question, different alphabets stand for various symbols as indicated below:
A" B means 'add B to A' A'B means 'subtract B from A'
A @ B means 'divide A by B' A * B means 'multiply A by B'

The time taken by two running trains in crossing each other is calculated by dividing the sum of the lenghts of two trains by the total speed of the two trains. If the length of the first train is L1, the length of the second train is L2; the speed of the first train is V1 and the speed of the second train is V2, which of the following expressions would represent the time taken?

  A.  (L1" L2) * (V1" V2)
  B.  (L1" L2) @ (V1" V2)
  C.  [(L1" L2) @ (V1" V2)] * 60
  D.  (L1' L2) @ (V1' V2)
     
   
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