Answer:
1/3 batches of brownies
Explanation:
If Andre used 4 1/2 sticks of butter to make multiple batches of brownies, then;
4 1/2 sticks = 2 batches brownies
To know the number of batches needed for 3/4 of a stick, we will say;
3/4 stick = x
Divide both expressions;
(9/2)/(3/4) = 2/x
9/2 * 4/3 = 2/x
36/6 = 2/x
6 = 2/x
6x = 2
x = 2/6
x = 1/3
Hence she will make 1/3 batches of brownies