10, 20, 12, 24, 16, 32, ? Answers:
A) 20	B) 21	C) 22	D) 23	E) 24
24   24   This is an alternating multiplication and subtracting series with a pattern x2, -8, x2, -8.
<result>E</result>
10, 20, 12, 24, 16, 32, ?