i will be thankful if you answer me
find the missing term
1. 5, 10, 20, 35, _, 80, _,
2. 18, 20, 24, _, 38, _,
3. 55, 54, 51, 46, _, _, 19,
4. 5, 10, 20, _, 80, _,
5. 160, 80, 40, _, _, 5,