For some unknown reason, Brainly won't post my answer as it assumes the answer has inappropriate words or a link.
So, I added the answer in the attached image.
Kindly check it.
It would be B because it does to -3
1 1/2 = 3/2. 7 1/2 = 15/2
15/2 divided by 3/2 = 5 batches of cookies
A2+B2=C2
12(2)+B(2)=27.1(2)
24+B=54.2
-24 -24
——————
B=30.2
Answer is 30.2
I hope this helps