Here are 20 similar math questions along with their solutions:

1. Liam thinks of a number.
   He multiplies it by 5, then subtracts 7.
   His answer is 18.
   What was the number Liam started with?
   Answer =

2. Ava thinks of a number.
   She doubles it, then adds 6.
   Her answer is 20.
   What was the number Ava started with?
   Answer =

3. Noah thinks of a number.
   He triples it, then subtracts 4.
   His answer is 26.
   What was the number Noah started with?
   Answer =

4. Mia thinks of a number.
   She multiplies it by 4, then adds 3.
   Her answer is 27.
   What was the number Mia started with?
   Answer =

5. Ethan thinks of a number.
   He divides it by 2, then adds 5.
   His answer is 11.
   What was the number Ethan started with?
   Answer =

6. Sophia thinks of a number.
   She subtracts 7, then multiplies the result by 2.
   Her answer is 18.
   What was the number Sophie started with?
   Answer =

7. James thinks of a number.
   He multiplies it by 6, then subtracts 2.
   His answer is 40.
   What was the number James started with?
   Answer =
   $x=7$

8. Isla thinks of a number.
   She multiplies it by 2, then subtracts 5.
   Her answer is 17.
   What was the number Isla started with?
   Answer =

9. Oliver thinks of a number.
   He adds 8, then divides by 3.
   His answer is 6.
   What was the number Oliver started with?
   Answer =

10. Emily thinks of a number.
    She subtracts 9, then divides by 2.
    Her answer is 4.
    What was the number Emily started with?
    Answer =

11. Lucas thinks of a number.
    He multiplies it by 7, then subtracts 10.
    His answer is 32.
    What was the number Lucas started with?
    Answer =

12. Ella thinks of a number.
    She divides it by 4, then adds 3.
    Her answer is 8.
    What was the number Ella started with?
    Answer =

13. Henry thinks of a number.
    He multiplies it by 5, then adds 12.
    His answer is 47.
    What was the number Henry started with?
    Answer =

14. Grace thinks of a number.
    She multiplies it by 8, then subtracts 6.
    Her answer is 50.
    What was the number Grace started with?
    Answer =

15. Jack thinks of a number.
    He divides it by 3, then subtracts 4.
    His answer is 5.
    What was the number Jack started with?
    Answer =

16. Lily thinks of a number.
    She subtracts 4, then multiplies by 5.
    Her answer is 35.
    What was the number Lily started with?
    Answer =

17. Benjamin thinks of a number.
    He adds 10, then divides by 2.
    His answer is 9.
    What was the number Benjamin started with?
    Answer =

18. Charlotte thinks of a number.
    She multiplies it by 9, then adds 4.
    Her answer is 85.
    What was the number Charlotte started with?
    Answer =
    $x=9$

19. Samuel thinks of a number.
    He subtracts 6, then multiplies by 3.
    His answer is 27.
    What was the number Samuel started with?
    Answer =

20. Zoe thinks of a number.
    She adds 7, then divides by 5.
    Her answer is 6.
    What was the number Zoe started with?
    Answer =