To find out how much more milk Abigail used than water, subtract the amount of water from the amount of milk.
Abigail used:
- Milk: \( \frac{3}{4} \) cups
- Water: \( \frac{1}{2} \) cups
First, we need to convert \( \frac{1}{2} \) to a fraction with a denominator of 4 to easily subtract:
\[ \frac{1}{2} = \frac{2}{4} \]
Now, subtract the amount of water from the amount of milk:
\[ \frac{3}{4} - \frac{2}{4} = \frac{1}{4} \]
So, Abigail used \( \frac{1}{4} \) cup more milk than water.