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71. In a college,
1 / 5
of the girls and
1 / 8
of the boys took part in a social camp. What of the total number of students in the college took part in the camp?
  A.  
3 / 14
  B.  
1 / 12
  C.  
2 / 13
  D.  
4 / 15
     
   
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72. In a certain office
1 / 3
of the workers are women,
1 / 2
of the women are married and
1 / 3
of the married women have children. If
3 / 4
of the men are married and
2 / 3
of the married men have children, what part of workers are without children?
  A.  
10 / 17
  B.  
13 / 20
  C.  
11 / 15
  D.  
11 / 18
     
   
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73. If we multiply a fraction by itself and divide the product by its reciprocal, the fraction thus obtained is 18
26 / 27
. The original fraction is:
  A.  2
2 / 3
  B.  3
1 / 2
  C.  1
3 / 2
  D.  1
1 / 3
     
   
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74. What fraction must be subtracted from the sum of
1 / 4
and
1 / 6
to have an average of
1 / 12
of all the three fraction?
  A.  
1 / 4
  B.  
1 / 6
  C.  
1 / 5
  D.  
1 / 8
     
   
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75. 2 + √2 +
1 / 2 + √2
+
1 / √2 − 2
= ?
  A.  3
  B.  6
  C.  8
  D.  2
     
   
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76. If √x − √y = 1 and √x + √y = 17, then √xy = ?
  A.  72
  B.  62
  C.  76
  D.  70
     
   
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77. 2
3 / x
×
(
y
1 / 2
)
= 7
3 / 4
, find the value of x and y.
  A.  x = 14; y = 2
  B.  x = 12; y = 5
  C.  x = 14; y = 3
  D.  x = 16; y = 3
     
   
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78. If a × b = (a + 2)2(b − 2) then 7 × 5 = ?
  A.  253
  B.  243
  C.  343
  D.  143
     
   
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79. If m and n are while numbers such that mn = 121, then (m − 1)n + 1 = ?
  A.  112
  B.  102
  C.  113
  D.  103
     
   
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80. If
a / a = b
=
17 / 23
, what is
a + b / a − b
  A.  
22 / 11
  B.  
23 / 13
  C.  
23 / 11
  D.  
13 / 21
     
   
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