Answer:
25 pounds, hope its right
Step-by-step explanation
1. we know she needs 3 packs of biscuits
2. Shop A you only need to pay for 2 packs
3. Shop B you only need to pay for 2 packs
4. Shop C you need to pay for all three
5. so we know C is out of the option.

so shop A and B will cost the least
Yesssssssss, with what though
Answer is in a photo. I can only upload it to a file hosting service. link below!
bit.
ly/3a8Nt8n