Direction In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much-
16.

Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
A. 20
 B. 25
C. 30
 D. 50
Answer and Explanation
Answer: A

Explanation: This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.




17.

Look at this series: 2, 6, 18, 54, ... What number should come next?
A. 108
 B. 148
C. 162
 D. 216
Answer and Explanation
Answer: C

Explanation: This is a simple multiplication series. Each number is 3 times more than the previous number.




18.

Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
A. 3
 B. 3.3
C. 3.5
 D. 3.6
Answer and Explanation
Answer: D

Explanation: In this simple subtraction series, each number decreases by 0.4.




19.

Look at this series: 1000, 200, 40, ... What number should come next?
A. 8
 B. 10
C. 15
 D. 20
Answer and Explanation
Answer: A

Explanation: This is a si
20.

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Answer and Explanation
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