What should come in place of the question mark '?' in the following number series?

6, 8, 11, 16, 23, ?

What should come in place of the question mark '?' in the following number series?

8.5, 9.5, 21, 66, ?, 1345

What should come in place of the question mark '?' in the following number series?

29, 30, 26, 35, ?, 44

What should come in place of the question mark '?' in the following number series?

77, 76, 84, 57, ?, – 4

What should come in place of the question mark '?' in the following number series?

0.25, 1.25, 4.5, ?, 70, 355