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46.
The value of
(2.3)3 - .027
(2.3)2 + .69 + .09
   
  • A.
    0
  • C.
    2
  • B.
    1.6
  • D.
    3.4
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Answer : [A]
Explanation :
 
Given expression =
(2.3)3 - (0.3)3
(2.3)2 + (2.3 x 0.3) + (0.3)2
=  
a3 - b3
a2 + ab + b2
     
 
  = (a - b) = (23 - 0.3) = 2    
 
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47.
892.7 - 573.07 - 95.007 = ?
  • A.
    224.623
  • C.
    233.523
  • B.
    224.777
  • D.
    414.637
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Answer : [A]
Explanation :
 
Given expression = 8927 - (573.07 + 95.007) = 8927 - 668.077 = 224.623
 
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48.
(0.09 x 7.3) is equal to:
  • A.
    .6
  • C.
    .67
  • B.
    .657
  • D.
    .657
  • Answer & Explanation
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Answer : [A]
Explanation :
 
0.09 x 7.3 =
9
99
 x 7
3
9
=
1
11
x
66
9
=
2
3
 = 0.6  
 
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49.
Which of the following fractions is the smallest?
  • A.
    13  
    16  
  • C.
    17  
    21  
  • B.
    15    
    19  
  • D.
    7    
    8  
  • Answer & Explanation
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Answer : [B]
Explanation :
 
We have :
13
16
 = 0.8125,
15
19
 = 0.7894,
17
21
 = 0.8095 and
7
8
 = 0.875.    
 
Since 0.7894 is the smallest, so
15
19

 is the smallest

   
 
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50.
If 213 x 16 = 3408, then 1.6 x 21.3 is equal to :
  • A.
    0.3408
  • C.
    34.08
  • B.
    3.408
  • D.
    340.8
  • Answer & Explanation
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Answer : [C]
Explanation :
 
1.6 x 213 =  
16
10
x
213
10
  =  
16 x 213
100
  =
3408
100
 = 34.08
 
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