1.  10, 5, 13, 10, 16, 20, 19, (....)
A. 22
B. 40
C. 38
D. 23

Answer: Option B

Explanation:

There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2.