Answer: 3 3/4
Step-by-step explanation: Take 4 out of 15 however many times is possible. 4 can be taken out of 15 3 times, so 4 times 3 is 12. Our regular number is going to be 3. the extra after multiplying is going to be the fraction. 15-12=3, so our fraction is 3/4. Combine it with 3, and you get 3 3/4, or 3 and 3/4ths.
To measure correctly, you can first measure out the 3 full cups, and then measure out an extra 3/4 cup.