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Exercise
Directions :
Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters; for these questions, look for a number series and a letter series.
11.
Look at this series: 0.15, 0.3, __, 1.2, 2.4, . . . What number should fill the blank?
  • A.
    4.8
  • C.
    0.6
  • B.
    0.006
  • D.
    0.9
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Answer : [C]
Explanation :
This is a simple multiplication series. Each number is 2 times greater than the previous number.
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12.
Look at this series: XXIV, XX, __, XII, VIII, . . . What number should fill the blank?
  • A.
    XXII
  • C.
    XVI
  • B.
    XIII
  • D.
    IV
  • Answer & Explanation
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Answer : [C]
Explanation :
This is a simple subtraction series; each number is 4 less than the previous number.
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13.
Look at this series: 70, 71, 76, __, 81, 86, 70, 91, . . . What number should fill the blank?
  • A.
    70
  • C.
    80
  • B.
    71
  • D.
    96
  • Answer & Explanation
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Answer : [A]
Explanation :
In this series, 5 is added to the previous number; the number 70 is inserted as every third number.
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14.
Look at this series: 664, 332, 340, 170, __, 89, . . . What number should fill the blank?
  • A.
    85
  • C.
    109
  • B.
    97
  • D.
    178
  • Answer & Explanation
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Answer : [D]
Explanation :
This is an alternating division and addition series: First, divide by 2, and then add 8.
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15.
Look at this series: 83, 73, 93, 63, __, 93, 43, . . . What number should fill the blank?
  • A.
    33
  • C.
    73
  • B.
    53
  • D.
    93
  • Answer & Explanation
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Answer : [B]
Explanation :
This is a simple subtraction series in which a random number, 93, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.
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