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16.  Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
A. 20
B. 25
C. 30
D. 50
17.  Look at this series: 2, 6, 18, 54, ... What number should come next?
A. 108
B. 148
C. 162
D. 216
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
19.  Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
A. 128
B. 226
C. 324
D. 429