Hey There!
Here is your answer:
The proper answer to this question is "1/4".
Reason:
What you have to do is subtract 3/4 from 1/2 in order to get your answer:
3*1=3
4*1=4
-
1*2=2
2*2=4
3-2=1
=1/4
Also....
In order to make 1/2 of the recipe Wanda would have to use 1/4 cups of butter.
(Hence): Have of 3/4 is 1/4.
Therefore the answer is 1/4
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit