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Logical Reasoning - Number Series

Exercise

"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
- Albert Einstein
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

16. 

Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
A. 20B. 25
C. 30D. 50
17. 

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

Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
A. 3B. 3.3
C. 3.5D. 3.6
19. 

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

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