Quant Quiz of the day

Solve the following number series

1. 4,3,5,24,55,?
2. 16,13.9,18.1,11.8,?
3. 2160,?,72,18,6,3
4. 6,3,3,4.5,9,?
5. 24,?,44,80,144,244
6. 1440,?,48,12,4,2
7. 22,19.7,24.3,17.4,?,15.1
8. 5, 4, 7, 20, 79, ?
9. 32, ?, 52, 88, 152, 252
10. 21, 37, 40.2, 88.2, 94.6, ?