What should come in place of the question mark '?' in the following number series?
21, 21.5, ?, 25.5, 29, 33.5
1
22
2
22.5
3
23
4
23.5
5
24
What should come in place of the question mark '?' in the following number series?
21, 21.5, ?, 25.5, 29, 33.5