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11.  Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
A. 4.2
B. 4.4
C. 4.7
D. 5.1
12.  Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?
A. 52
B. 56
C. 96
D. 128
13.  Look at this series: 2, 4, 6, 8, 10, ... What number should come next?
A. 11
B. 12
C. 13
D. 14
14.  Look at this series: 201, 202, 204, 207, ... What number should come next?
A. 205
B. 208
C. 210
D. 211
15.  Look at this series: 544, 509, 474, 439, ... What number should come next?
A. 404
B. 414
C. 420
D. 445