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11. A man was 31 years of age when he had his first son. His wife waas 26 years of age when his son attained the age of 7 years. The difference in age between the man and his wife is :

  A.  7 years
  B.  9 years
  C.  5 years
  D.  12 years
     
   
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12. 12 years old Sami is three times as old as his brother Vinay. How old will Sami be when he is twice as old as Vinay?
  A.  18 years
  B.  14 years
  C.  16 years
  D.  20 years
     
   
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13. The sum of ages of 4 children born at intervals of 4 years each is 60. What is the age of the youngest child?
  A.  7 years
  B.  12 years
  C.  10 years
  D.  9 years
     
   
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14. Two years ago, Aadhya was three times as old as his son and two years hence, twice her age will be equal to five times that of her son. Find Aadhya's present age.

  A.  42 years
  B.  36 years
  C.  34 years
  D.  38 years
     
   
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15. The average age of 19 boys in a class is 21 years. If the teacher's age is included,the average increases to 22 years. What is the teacher's age?
  A.  39 years
  B.  41 years
  C.  40 years
  D.  44 years
     
   
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16. 11 × 12 × 13 = 234, 24 × 23 × 35 = 658, 31 × 43 × 54 = ?

  A.  479
  B.  974
  C.  749
  D.  497
     
   
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17. 16 (210) 14, 14 (156) 12, 12 (?) 10

  A.  100
  B.  110
  C.  120
  D.  90
     
   
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18. A = 3(21) 247, B = 5(-) 407, C = 7(49) 567

  A.  28
  B.  25
  C.  38
  D.  35
     
   
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19. Which of the following operations will result in '22'?

  A.  16 ÷ 12 + 8 − 13 × 15
  B.  16 − 12 × 8 ÷ 13 + 15
  C.  16 × 12 ÷ 8 + 13 − 15
  D.  16 + 12 − 8 × 13 ÷ 15
     
   
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20. Certain equations are based on a certain system.Find out the correct anser for unsolved equation on that basis :

If 14 × 13 = 128 and 16 × 13 = 280 then 15 × 11 = ?

  A.  156
  B.  516
  C.  165
  D.  615
     
   
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Let the number of keepers = x
The, total number of feet = 2 × 50 + 4 × 45 + 4 × 8 + 2x = 2x + 312
Total numbers of heads = 50 + 45 + 8 + x = 103 + x
Now, as per equation, (2x + 312) = (103 + x) + 224
2x - x = 103 + 224 − 312
x = 15
. Hence, option (C) is the correct answer.

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