Let's break down the clues one by one to solve the puzzle:
1. **The child who is dressed as the monster has collected 20 sweets.**
→ The monster collected 20 sweets.
2. **Danny is not wearing a witch costume.**
→ Danny is not the witch.
3. **Jodie has collected the least sweets of the four children.**
→ Jodie collected the fewest sweets (15).
4. **The child dressed as the spooky ghost has collected five more sweets than the monster.**
→ The ghost collected 25 sweets (because the monster has 20 sweets, and the ghost has 5 more).
5. **Seb’s goody bag contains 20 sweets.**
→ Seb is the monster (since the monster has 20 sweets).
6. **Natasha is the child wearing the orange pumpkin costume.**
→ Natasha is dressed as the pumpkin.
7. **The monster costume is not worn by Jodie or Danny.**
→ Since Seb is the monster, Jodie and Danny are not.
8. **Natasha has collected five more sweets than the child dressed as the ghost! Natasha is not the witch!**
→ Natasha (pumpkin) collected 30 sweets. The ghost collected 25 sweets. Natasha is not the witch.
### Filling in the table:
- **Seb** is the monster and collected **20 sweets**.
- **Jodie** collected the least sweets, which is **15**, and since Natasha is the pumpkin, Jodie must be the **witch**.
- **Natasha** is the **pumpkin** and collected **30 sweets**.
- **Danny** must be the **ghost** (the only remaining costume) and collected **25 sweets**.
### Final Answers:
| Child | Number of sweets | Costume |
|---------|------------------|----------|
| Jodie | 15 | Witch |
| Danny | 25 | Ghost |
| Seb | 20 | Monster |
| Natasha | 30 | Pumpkin |