(a) Weiling has more sweets than Maggie because 12 is greater than 8.

(b) To find out how many more sweets Weiling has than Maggie, we subtract the number of sweets Maggie has from the number of sweets Weiling has:

12 (Weiling) - 8 (Maggie) = 4

So, Weiling has 4 more sweets than Maggie.

(c) Weiling wants to give Maggie some sweets so that they have the same number of sweets. To do this, Weiling needs to give Maggie the difference in the number of sweets they currently have, which is 4.

Therefore, Weiling must give Maggie 4 sweets.