Number Series Aptitude Q & A – Part 8

This is the Part 8 Aptitude Questions and Answers section on Number series with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand. 

71. Look at this series: 664, 332, 340, 170, ____, 89, … What number should fill the blank?
A. 85
B. 97
C. 109
D. 178
Answer:
D. 178
Explanation:
This is an alternating division and addition series: First, divide by 2, and then add 8.

72. Look at this series: F2, __, D8, C16, B32, … What number should fill the blank?
A. A16
B. G4
C. E4
D. E3
Answer:
C. E4
Explanation:
The letters decrease by 1; the numbers are multiplied by 2.

73. Look at this series: V, VIII, XI, XIV, __, XX, … What number should fill the blank?
A. IX
B. XXIII
C. XV
D. XVII
Answer:
D. XVII
Explanation:
This is a simple addition series; each number is 3 more than the previous number.

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