Directions to Solve
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
1. Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
A. 20
B. 25
C. 30
D. 50
2. Look at this series: 2, 6, 18, 54, ... What number should come next?
A. 108
B. 148
C. 162
D. 216
3. 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
4. Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
A. 128
B. 226
C. 324
D. 429
ANSWERS:
1. Answer: Option 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.
2. Answer: Option C
Explanation: This is a simple multiplication series. Each number is 3 times more than the previous number.
3. Answer: Option D
Explanation: In this simple subtraction series, each number decreases by 0.4.
4. Answer: Option D
Explanation:
8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ...
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